diff --git a/src/core/elements_maybe_signal.rs b/src/core/elements_maybe_signal.rs
index 9902280..069cd7b 100644
--- a/src/core/elements_maybe_signal.rs
+++ b/src/core/elements_maybe_signal.rs
@@ -4,8 +4,10 @@ use cfg_if::cfg_if;
 use leptos::html::{ElementType, HtmlElement};
 use leptos::prelude::wrappers::read::Signal;
 use leptos::prelude::*;
+use send_wrapper::SendWrapper;
 use std::marker::PhantomData;
 use std::ops::Deref;
+use wasm_bindgen::JsCast;
 
 /// Used as an argument type to make it easily possible to pass either
 /// * a `web_sys` element that implements `E` (for example `EventTarget` or `Element`),
@@ -58,9 +60,9 @@ impl<T, E> With for ElementsMaybeSignal<T, E>
 where
     T: Into<E> + Clone + 'static,
 {
-    type Value = Vec<Option<T>>;
+    type Value = Vec<Option<SendWrapper<T>>>;
 
-    fn with<O>(&self, f: impl FnOnce(&Vec<Option<T>>) -> O) -> O {
+    fn with<O>(&self, f: impl FnOnce(&Vec<Option<SendWrapper<T>>>) -> O) -> O {
         match self {
             Self::Static(v) => f(v),
             Self::Dynamic(s) => s.with(f),
@@ -68,7 +70,7 @@ where
         }
     }
 
-    fn try_with<O>(&self, f: impl FnOnce(&Vec<Option<T>>) -> O) -> Option<O> {
+    fn try_with<O>(&self, f: impl FnOnce(&Vec<Option<SendWrapper<T>>>) -> O) -> Option<O> {
         match self {
             Self::Static(v) => Some(f(v)),
             Self::Dynamic(s) => s.try_with(f),
@@ -81,9 +83,9 @@ impl<T, E> WithUntracked for ElementsMaybeSignal<T, E>
 where
     T: Into<E> + Clone + 'static,
 {
-    type Value = Vec<Option<T>>;
+    type Value = Vec<Option<SendWrapper<T>>>;
 
-    fn with_untracked<O>(&self, f: impl FnOnce(&Vec<Option<T>>) -> O) -> O {
+    fn with_untracked<O>(&self, f: impl FnOnce(&Vec<Option<SendWrapper<T>>>) -> O) -> O {
         match self {
             Self::Static(t) => f(t),
             Self::Dynamic(s) => s.with_untracked(f),
@@ -91,7 +93,10 @@ where
         }
     }
 
-    fn try_with_untracked<O>(&self, f: impl FnOnce(&Vec<Option<T>>) -> O) -> Option<O> {
+    fn try_with_untracked<O>(
+        &self,
+        f: impl FnOnce(&Vec<Option<SendWrapper<T>>>) -> O,
+    ) -> Option<O> {
         match self {
             Self::Static(t) => Some(f(t)),
             Self::Dynamic(s) => s.try_with_untracked(f),
@@ -107,7 +112,7 @@ where
     T: Into<E> + Clone + 'static,
 {
     fn from(value: T) -> Self {
-        ElementsMaybeSignal::Static(vec![Some(value)])
+        ElementsMaybeSignal::Static(vec![Some(SendWrapper::new(value))])
     }
 }
 
@@ -116,7 +121,7 @@ where
     T: Into<E> + Clone + 'static,
 {
     fn from(target: Option<T>) -> Self {
-        ElementsMaybeSignal::Static(vec![target])
+        ElementsMaybeSignal::Static(vec![target.map(SendWrapper::new)])
     }
 }
 
@@ -127,7 +132,7 @@ macro_rules! impl_from_deref_option {
             E: From<$ty2> + 'static,
         {
             fn from(value: $ty) -> Self {
-                Self::Static(vec![(*value).clone()])
+                Self::Static(vec![(*value).clone().map(SendWrapper::new)])
             }
         }
     };
@@ -185,7 +190,7 @@ macro_rules! impl_from_signal_string {
                                 let mut list = Vec::with_capacity(node_list.length() as usize);
                                 for i in 0..node_list.length() {
                                     let node = node_list.get(i).expect("checked the range");
-                                    list.push(Some(node));
+                                    list.push(Some(SendWrapper::new(node)));
                                 }
                                 list
                             } else {
@@ -209,8 +214,8 @@ impl_from_signal_string!(Memo<String>);
 
 impl_from_signal_string!(Signal<&str>);
 impl_from_signal_string!(ReadSignal<&str>);
-impl_from_signal_string!(RwSignal<&str>);
-impl_from_signal_string!(Memo<&str>);
+impl_from_signal_string!(RwSignal<&'static str>);
+impl_from_signal_string!(Memo<&'static str>);
 
 // From single signal ///////////////////////////////////////////////////////////////
 
@@ -227,10 +232,10 @@ macro_rules! impl_from_signal_option {
     };
 }
 
-impl_from_signal_option!(Signal<Option<T>>);
-impl_from_signal_option!(ReadSignal<Option<T>>);
-impl_from_signal_option!(RwSignal<Option<T>>);
-impl_from_signal_option!(Memo<Option<T>>);
+impl_from_signal_option!(Signal<Option<SendWrapper<T>>>);
+impl_from_signal_option!(ReadSignal<Option<SendWrapper<T>>>);
+impl_from_signal_option!(RwSignal<Option<SendWrapper<T>>>);
+impl_from_signal_option!(Memo<Option<SendWrapper<T>>>);
 
 macro_rules! impl_from_signal {
     ($ty:ty) => {
@@ -245,10 +250,10 @@ macro_rules! impl_from_signal {
     };
 }
 
-impl_from_signal!(Signal<T>);
-impl_from_signal!(ReadSignal<T>);
-impl_from_signal!(RwSignal<T>);
-impl_from_signal!(Memo<T>);
+impl_from_signal!(Signal<SendWrapper<T>>);
+impl_from_signal!(ReadSignal<SendWrapper<T>>);
+impl_from_signal!(RwSignal<SendWrapper<T>>);
+impl_from_signal!(Memo<SendWrapper<T>>);
 
 // From single NodeRef //////////////////////////////////////////////////////////////
 
@@ -257,13 +262,13 @@ macro_rules! impl_from_node_ref {
         impl<R> From<NodeRef<R>> for ElementsMaybeSignal<$ty, $ty>
         where
             R: ElementType + Clone + 'static,
+            R::Output: JsCast + Into<$ty> + Clone + 'static,
         {
             fn from(node_ref: NodeRef<R>) -> Self {
                 Self::Dynamic(Signal::derive(move || {
                     vec![node_ref.get().map(move |el| {
-                        let el = el.into_any();
-                        let el: $ty = el.deref().clone().into();
-                        el
+                        let el: $ty = el.clone().into();
+                        SendWrapper::new(el)
                     })]
                 }))
             }
@@ -276,23 +281,23 @@ impl_from_node_ref!(web_sys::Element);
 
 // From single leptos::html::HTMLElement ///////////////////////////////////////////
 
-macro_rules! impl_from_html_element {
-    ($ty:ty) => {
-        impl<E, At, Ch, Rndr> From<HtmlElement<E, At, Ch, Rndr>> for ElementsMaybeSignal<$ty, $ty>
-        where
-            E: ElementType,
-            E::Output: std::ops::Deref<Target = $ty>,
-        {
-            fn from(value: HtmlElement<E, At, Ch, Rndr>) -> Self {
-                let el: &$ty = value.deref();
-                Self::Static(vec![Some(el.clone())])
-            }
-        }
-    };
-}
-
-impl_from_html_element!(web_sys::EventTarget);
-impl_from_html_element!(web_sys::Element);
+// macro_rules! impl_from_html_element {
+//     ($ty:ty) => {
+//         impl<E, At, Ch, Rndr> From<HtmlElement<E, At, Ch, Rndr>> for ElementsMaybeSignal<$ty, $ty>
+//         where
+//             E: ElementType,
+//             E::Output: std::ops::Deref<Target = $ty>,
+//         {
+//             fn from(value: HtmlElement<E, At, Ch, Rndr>) -> Self {
+//                 let el: &$ty = value.deref();
+//                 Self::Static(vec![Some(el.clone())])
+//             }
+//         }
+//     };
+// }
+//
+// impl_from_html_element!(web_sys::EventTarget);
+// impl_from_html_element!(web_sys::Element);
 
 // From multiple static elements //////////////////////////////////////////////////////
 
@@ -301,7 +306,12 @@ where
     T: Into<E> + Clone + 'static,
 {
     fn from(target: &[T]) -> Self {
-        Self::Static(target.iter().map(|t| Some(t.clone())).collect())
+        Self::Static(
+            target
+                .iter()
+                .map(|t| Some(SendWrapper::new(t.clone())))
+                .collect(),
+        )
     }
 }
 
@@ -310,7 +320,12 @@ where
     T: Into<E> + Clone + 'static,
 {
     fn from(target: &[Option<T>]) -> Self {
-        Self::Static(target.to_vec())
+        Self::Static(
+            target
+                .iter()
+                .map(|t| t.clone().map(SendWrapper::new))
+                .collect(),
+        )
     }
 }
 
@@ -319,7 +334,12 @@ where
     T: Into<E> + Clone + 'static,
 {
     fn from(target: Vec<T>) -> Self {
-        Self::Static(target.iter().map(|t| Some(t.clone())).collect())
+        Self::Static(
+            target
+                .iter()
+                .map(|t| Some(SendWrapper::new(t.clone())))
+                .collect(),
+        )
     }
 }
 
@@ -328,7 +348,12 @@ where
     T: Into<E> + Clone + 'static,
 {
     fn from(target: Vec<Option<T>>) -> Self {
-        Self::Static(target.to_vec())
+        Self::Static(
+            target
+                .into_iter()
+                .map(|t| t.map(SendWrapper::new))
+                .collect(),
+        )
     }
 }
 
@@ -337,7 +362,12 @@ where
     T: Into<E> + Clone + 'static,
 {
     fn from(target: [T; C]) -> Self {
-        Self::Static(target.iter().map(|t| Some(t.clone())).collect())
+        Self::Static(
+            target
+                .into_iter()
+                .map(|t| Some(SendWrapper::new(t)))
+                .collect(),
+        )
     }
 }
 
@@ -346,7 +376,12 @@ where
     T: Into<E> + Clone + 'static,
 {
     fn from(target: [Option<T>; C]) -> Self {
-        Self::Static(target.to_vec())
+        Self::Static(
+            target
+                .into_iter()
+                .map(|t| t.map(SendWrapper::new))
+                .collect(),
+        )
     }
 }
 
@@ -357,7 +392,7 @@ macro_rules! impl_from_strings_inner {
         Self::Static(
             $target
                 .iter()
-                .filter_map(|sel: &$str_ty| -> Option<Vec<Option<$el_ty>>> {
+                .filter_map(|sel: &$str_ty| -> Option<Vec<Option<SendWrapper<$el_ty>>>> {
                     cfg_if! { if #[cfg(feature = "ssr")] {
                         let _ = sel;
                         None
@@ -368,7 +403,7 @@ macro_rules! impl_from_strings_inner {
                             let mut list = Vec::with_capacity(node_list.length() as usize);
                             for i in 0..node_list.length() {
                                 let node: $el_ty = node_list.get(i).expect("checked the range").unchecked_into();
-                                list.push(Some(node));
+                                list.push(Some(SendWrapper::new(node)));
                             }
 
                             Some(list)
@@ -417,33 +452,33 @@ impl_from_strings!(web_sys::EventTarget, String);
 
 // From signal of vec ////////////////////////////////////////////////////////////////
 
-impl<T, E> From<Signal<Vec<T>>> for ElementsMaybeSignal<T, E>
+impl<T, E> From<Signal<Vec<SendWrapper<T>>>> for ElementsMaybeSignal<T, E>
 where
     T: Into<E> + Clone + 'static,
 {
-    fn from(signal: Signal<Vec<T>>) -> Self {
+    fn from(signal: Signal<Vec<SendWrapper<T>>>) -> Self {
         Self::Dynamic(Signal::derive(move || {
             signal.get().into_iter().map(|t| Some(t)).collect()
         }))
     }
 }
 
-impl<T, E> From<Signal<Vec<Option<T>>>> for ElementsMaybeSignal<T, E>
+impl<T, E> From<Signal<Vec<Option<SendWrapper<T>>>>> for ElementsMaybeSignal<T, E>
 where
     T: Into<E> + Clone + 'static,
 {
-    fn from(target: Signal<Vec<Option<T>>>) -> Self {
+    fn from(target: Signal<Vec<Option<SendWrapper<T>>>>) -> Self {
         Self::Dynamic(target)
     }
 }
 
 // From multiple signals //////////////////////////////////////////////////////////////
 
-impl<T, E> From<&[Signal<T>]> for ElementsMaybeSignal<T, E>
+impl<T, E> From<&[Signal<SendWrapper<T>>]> for ElementsMaybeSignal<T, E>
 where
     T: Into<E> + Clone + 'static,
 {
-    fn from(list: &[Signal<T>]) -> Self {
+    fn from(list: &[Signal<SendWrapper<T>>]) -> Self {
         let list = list.to_vec();
 
         Self::Dynamic(Signal::derive(move || {
@@ -452,11 +487,11 @@ where
     }
 }
 
-impl<T, E> From<&[Signal<Option<T>>]> for ElementsMaybeSignal<T, E>
+impl<T, E> From<&[Signal<Option<SendWrapper<T>>>]> for ElementsMaybeSignal<T, E>
 where
     T: Into<E> + Clone + 'static,
 {
-    fn from(list: &[Signal<Option<T>>]) -> Self {
+    fn from(list: &[Signal<Option<SendWrapper<T>>>]) -> Self {
         let list = list.to_vec();
 
         Self::Dynamic(Signal::derive(move || {
@@ -465,11 +500,11 @@ where
     }
 }
 
-impl<T, E> From<Vec<Signal<T>>> for ElementsMaybeSignal<T, E>
+impl<T, E> From<Vec<Signal<SendWrapper<T>>>> for ElementsMaybeSignal<T, E>
 where
     T: Into<E> + Clone + 'static,
 {
-    fn from(list: Vec<Signal<T>>) -> Self {
+    fn from(list: Vec<Signal<SendWrapper<T>>>) -> Self {
         let list = list.clone();
 
         Self::Dynamic(Signal::derive(move || {
@@ -478,11 +513,11 @@ where
     }
 }
 
-impl<T, E> From<Vec<Signal<Option<T>>>> for ElementsMaybeSignal<T, E>
+impl<T, E> From<Vec<Signal<Option<SendWrapper<T>>>>> for ElementsMaybeSignal<T, E>
 where
     T: Into<E> + Clone + 'static,
 {
-    fn from(list: Vec<Signal<Option<T>>>) -> Self {
+    fn from(list: Vec<Signal<Option<SendWrapper<T>>>>) -> Self {
         let list = list.clone();
 
         Self::Dynamic(Signal::derive(move || {
@@ -491,11 +526,11 @@ where
     }
 }
 
-impl<T, E, const C: usize> From<[Signal<T>; C]> for ElementsMaybeSignal<T, E>
+impl<T, E, const C: usize> From<[Signal<SendWrapper<T>>; C]> for ElementsMaybeSignal<T, E>
 where
     T: Into<E> + Clone + 'static,
 {
-    fn from(list: [Signal<T>; C]) -> Self {
+    fn from(list: [Signal<SendWrapper<T>>; C]) -> Self {
         let list = list.to_vec();
 
         Self::Dynamic(Signal::derive(move || {
@@ -504,11 +539,11 @@ where
     }
 }
 
-impl<T, E, const C: usize> From<[Signal<Option<T>>; C]> for ElementsMaybeSignal<T, E>
+impl<T, E, const C: usize> From<[Signal<Option<SendWrapper<T>>>; C]> for ElementsMaybeSignal<T, E>
 where
     T: Into<E> + Clone + 'static,
 {
-    fn from(list: [Signal<Option<T>>; C]) -> Self {
+    fn from(list: [Signal<Option<SendWrapper<T>>>; C]) -> Self {
         let list = list.to_vec();
 
         Self::Dynamic(Signal::derive(move || {
@@ -526,9 +561,8 @@ macro_rules! impl_from_multi_node_ref_inner {
                 .iter()
                 .map(|node_ref| {
                     node_ref.get().map(move |el| {
-                        let el = el.into_any();
-                        let el: $ty = el.deref().clone().into();
-                        el
+                        let el: $ty = el.clone().into();
+                        SendWrapper::new(el)
                     })
                 })
                 .collect()
@@ -541,6 +575,7 @@ macro_rules! impl_from_multi_node_ref {
         impl<R> From<&[NodeRef<R>]> for ElementsMaybeSignal<$ty, $ty>
         where
             R: ElementType + Clone + 'static,
+            R::Output: JsCast + Into<$ty> + Clone + 'static,
         {
             fn from(node_refs: &[NodeRef<R>]) -> Self {
                 let node_refs = node_refs.to_vec();
@@ -551,6 +586,7 @@ macro_rules! impl_from_multi_node_ref {
         impl<R, const C: usize> From<[NodeRef<R>; C]> for ElementsMaybeSignal<$ty, $ty>
         where
             R: ElementType + Clone + 'static,
+            R::Output: JsCast + Into<$ty> + Clone + 'static,
         {
             fn from(node_refs: [NodeRef<R>; C]) -> Self {
                 let node_refs = node_refs.to_vec();
@@ -561,6 +597,7 @@ macro_rules! impl_from_multi_node_ref {
         impl<R> From<Vec<NodeRef<R>>> for ElementsMaybeSignal<$ty, $ty>
         where
             R: ElementType + Clone + 'static,
+            R::Output: JsCast + Into<$ty> + Clone + 'static,
         {
             fn from(node_refs: Vec<NodeRef<R>>) -> Self {
                 let node_refs = node_refs.clone();
diff --git a/src/core/maybe_rw_signal.rs b/src/core/maybe_rw_signal.rs
index cc7cbd0..3ac2b67 100644
--- a/src/core/maybe_rw_signal.rs
+++ b/src/core/maybe_rw_signal.rs
@@ -50,26 +50,38 @@ impl<T> From<Signal<T>> for MaybeRwSignal<T> {
     }
 }
 
-impl<T> From<ReadSignal<T>> for MaybeRwSignal<T> {
+impl<T> From<ReadSignal<T>> for MaybeRwSignal<T>
+where
+    T: Send + Sync,
+{
     fn from(s: ReadSignal<T>) -> Self {
         Self::DynamicRead(s.into())
     }
 }
 
-impl<T> From<Memo<T>> for MaybeRwSignal<T> {
+impl<T> From<Memo<T>> for MaybeRwSignal<T>
+where
+    T: Send + Sync,
+{
     fn from(s: Memo<T>) -> Self {
         Self::DynamicRead(s.into())
     }
 }
 
-impl<T> From<RwSignal<T>> for MaybeRwSignal<T> {
+impl<T> From<RwSignal<T>> for MaybeRwSignal<T>
+where
+    T: Send + Sync,
+{
     fn from(s: RwSignal<T>) -> Self {
         let (r, w) = s.split();
         Self::DynamicRw(r.into(), w)
     }
 }
 
-impl<T> From<(ReadSignal<T>, WriteSignal<T>)> for MaybeRwSignal<T> {
+impl<T> From<(ReadSignal<T>, WriteSignal<T>)> for MaybeRwSignal<T>
+where
+    T: Send + Sync,
+{
     fn from(s: (ReadSignal<T>, WriteSignal<T>)) -> Self {
         Self::DynamicRw(s.0.into(), s.1)
     }
@@ -87,7 +99,10 @@ impl From<&str> for MaybeRwSignal<String> {
     }
 }
 
-impl<T: Clone> MaybeRwSignal<T> {
+impl<T: Clone> MaybeRwSignal<T>
+where
+    T: Send + Sync,
+{
     pub fn into_signal(self) -> (Signal<T>, WriteSignal<T>) {
         match self {
             Self::DynamicRead(s) => {
diff --git a/src/core/use_rw_signal.rs b/src/core/use_rw_signal.rs
index a57ec23..73a7e85 100644
--- a/src/core/use_rw_signal.rs
+++ b/src/core/use_rw_signal.rs
@@ -22,7 +22,7 @@ where
 
 impl<T> Default for UseRwSignal<T>
 where
-    T: Default,
+    T: Default + Send + Sync,
 {
     fn default() -> Self {
         Self::Combined(Default::default())
@@ -47,7 +47,10 @@ impl<T> DefinedAt for UseRwSignal<T> {
     }
 }
 
-impl<T> With for UseRwSignal<T> {
+impl<T> With for UseRwSignal<T>
+where
+    T: Send + Sync,
+{
     type Value = T;
 
     fn with<R>(&self, f: impl FnOnce(&T) -> R) -> R {
@@ -65,7 +68,10 @@ impl<T> With for UseRwSignal<T> {
     }
 }
 
-impl<T> WithUntracked for UseRwSignal<T> {
+impl<T> WithUntracked for UseRwSignal<T>
+where
+    T: Send + Sync,
+{
     type Value = T;
 
     fn with_untracked<R>(&self, f: impl FnOnce(&T) -> R) -> R {
diff --git a/src/lib.rs b/src/lib.rs
index 41112af..aaf827c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -25,11 +25,11 @@ mod is_none;
 mod is_ok;
 mod is_some;
 mod on_click_outside;
-mod use_user_media;
 mod signal_debounced;
 mod signal_throttled;
 mod sync_signal;
-mod use_active_element;
+mod use_user_media;
+// mod use_active_element;
 mod use_breakpoints;
 mod use_broadcast_channel;
 mod use_color_mode;
@@ -91,11 +91,11 @@ pub use is_none::*;
 pub use is_ok::*;
 pub use is_some::*;
 pub use on_click_outside::*;
-pub use use_user_media::*;
 pub use signal_debounced::*;
 pub use signal_throttled::*;
 pub use sync_signal::*;
-pub use use_active_element::*;
+pub use use_user_media::*;
+// pub use use_active_element::*;
 pub use use_breakpoints::*;
 pub use use_broadcast_channel::*;
 pub use use_color_mode::*;
diff --git a/src/math/shared.rs b/src/math/shared.rs
index 3d96dcd..1b6e231 100644
--- a/src/math/shared.rs
+++ b/src/math/shared.rs
@@ -7,9 +7,9 @@ macro_rules! use_partial_cmp {
         pub fn $fn_name<C, S, N>(container: S) -> Signal<Option<N>>
         where
             S: Into<MaybeSignal<C>>,
-            C: 'static,
+            C: Send + Sync + 'static,
             for<'a> &'a C: IntoIterator<Item = &'a N>,
-            N: PartialOrd + Clone,
+            N: PartialOrd + Clone + Send + Sync,
         {
             let container = container.into();
 
@@ -47,8 +47,8 @@ macro_rules! use_simple_math {
             $(#[$outer])*
             pub fn [<use_ $fn_name>]<S, N>(x: S) -> Signal<N>
             where
-                S: Into<MaybeSignal<N>>,
-                N: Float,
+                S: Into<MaybeSignal<N>> + Send + Sync,
+                N: Float + Send + Sync,
             {
                 let x = x.into();
                 Signal::derive(move || x.get().$fn_name())
diff --git a/src/sync_signal.rs b/src/sync_signal.rs
index 0595ffe..0887624 100644
--- a/src/sync_signal.rs
+++ b/src/sync_signal.rs
@@ -148,7 +148,7 @@ pub fn sync_signal<T>(
     right: impl Into<UseRwSignal<T>>,
 ) -> impl Fn() + Clone
 where
-    T: Clone + PartialEq + 'static,
+    T: Clone + PartialEq + Send + Sync + 'static,
 {
     sync_signal_with_options(left, right, SyncSignalOptions::default())
 }
@@ -160,8 +160,8 @@ pub fn sync_signal_with_options<L, R>(
     options: SyncSignalOptions<L, R>,
 ) -> impl Fn() + Clone
 where
-    L: Clone + PartialEq + 'static,
-    R: Clone + PartialEq + 'static,
+    L: Clone + PartialEq + Send + Sync + 'static,
+    R: Clone + PartialEq + Send + Sync + 'static,
 {
     let SyncSignalOptions {
         immediate,
diff --git a/src/use_breakpoints.rs b/src/use_breakpoints.rs
index 33016ca..fee58fe 100644
--- a/src/use_breakpoints.rs
+++ b/src/use_breakpoints.rs
@@ -110,7 +110,7 @@ use std::hash::Hash;
 ///
 /// Since internally this uses [`use_media_query`], which returns always `false` on the server,
 /// the returned methods also will return `false`.
-pub fn use_breakpoints<K: Eq + Hash + Debug + Clone>(
+pub fn use_breakpoints<K: Eq + Hash + Debug + Clone + Send + Sync>(
     breakpoints: HashMap<K, u32>,
 ) -> UseBreakpointsReturn<K> {
     UseBreakpointsReturn { breakpoints }
@@ -118,7 +118,7 @@ pub fn use_breakpoints<K: Eq + Hash + Debug + Clone>(
 
 /// Return type of [`use_breakpoints`]
 #[derive(Clone)]
-pub struct UseBreakpointsReturn<K: Eq + Hash + Debug + Clone> {
+pub struct UseBreakpointsReturn<K: Eq + Hash + Debug + Clone + Send + Sync> {
     breakpoints: HashMap<K, u32>,
 }
 
@@ -184,7 +184,7 @@ macro_rules! impl_cmp_reactively {
     };
 }
 
-impl<K: Eq + Hash + Debug + Clone> UseBreakpointsReturn<K> {
+impl<K: Eq + Hash + Debug + Clone + Send + Sync> UseBreakpointsReturn<K> {
     fn match_(query: &str) -> bool {
         if let Ok(Some(query_list)) = use_window().match_media(query) {
             return query_list.matches();
diff --git a/src/use_broadcast_channel.rs b/src/use_broadcast_channel.rs
index 22fe06d..9abd612 100644
--- a/src/use_broadcast_channel.rs
+++ b/src/use_broadcast_channel.rs
@@ -4,6 +4,7 @@ use crate::{
 use codee::{CodecError, Decoder, Encoder};
 use leptos::ev::messageerror;
 use leptos::prelude::*;
+use send_wrapper::SendWrapper;
 use thiserror::Error;
 use wasm_bindgen::JsValue;
 
@@ -80,12 +81,15 @@ pub fn use_broadcast_channel<T, C>(
     <C as Decoder<T>>::Error,
 >
 where
+    T: Send + Sync,
     C: Encoder<T, Encoded = String> + Decoder<T, Encoded = str>,
+    <C as Encoder<T>>::Error: Send + Sync,
+    <C as Decoder<T>>::Error: Send + Sync,
 {
     let is_supported = use_supported(|| js!("BroadcastChannel" in &window()));
 
     let (is_closed, set_closed) = signal(false);
-    let (channel, set_channel) = signal(None::<web_sys::BroadcastChannel>);
+    let (channel, set_channel) = signal(None::<SendWrapper<web_sys::BroadcastChannel>>);
     let (message, set_message) = signal(None::<T>);
     let (error, set_error) = signal(
         None::<UseBroadcastChannelError<<C as Encoder<T>>::Error, <C as Decoder<T>>::Error>>,
@@ -99,7 +103,9 @@ where
                         channel
                             .post_message(&msg.into())
                             .map_err(|err| {
-                                set_error.set(Some(UseBroadcastChannelError::PostMessage(err)))
+                                set_error.set(Some(UseBroadcastChannelError::PostMessage(
+                                    SendWrapper::new(err),
+                                )))
                             })
                             .ok();
                     }
@@ -124,7 +130,7 @@ where
 
     if is_supported.get_untracked() {
         let channel_val = web_sys::BroadcastChannel::new(name).ok();
-        set_channel.set(channel_val.clone());
+        set_channel.set(channel_val.clone().map(SendWrapper::new));
 
         if let Some(channel) = channel_val {
             let _ = use_event_listener_with_options(
@@ -151,7 +157,9 @@ where
                 channel.clone(),
                 messageerror,
                 move |event| {
-                    set_error.set(Some(UseBroadcastChannelError::MessageEvent(event)));
+                    set_error.set(Some(UseBroadcastChannelError::MessageEvent(
+                        SendWrapper::new(event),
+                    )));
                 },
                 UseEventListenerOptions::default().passive(true),
             );
@@ -188,7 +196,7 @@ where
     pub is_supported: Signal<bool>,
 
     /// The broadcast channel that is wrapped by this function
-    pub channel: Signal<Option<web_sys::BroadcastChannel>>,
+    pub channel: Signal<Option<SendWrapper<web_sys::BroadcastChannel>>>,
 
     /// Latest message received from the channel
     pub message: Signal<Option<T>>,
@@ -209,9 +217,9 @@ where
 #[derive(Debug, Error)]
 pub enum UseBroadcastChannelError<E, D> {
     #[error("failed to post message")]
-    PostMessage(JsValue),
+    PostMessage(SendWrapper<JsValue>),
     #[error("channel message error")]
-    MessageEvent(web_sys::MessageEvent),
+    MessageEvent(SendWrapper<web_sys::MessageEvent>),
     #[error("failed to (de)encode value")]
     Codec(CodecError<E, D>),
     #[error("received value is not a string")]
diff --git a/src/use_device_orientation.rs b/src/use_device_orientation.rs
index d7b1265..d2db892 100644
--- a/src/use_device_orientation.rs
+++ b/src/use_device_orientation.rs
@@ -36,10 +36,10 @@ use leptos::prelude::wrappers::read::Signal;
 pub fn use_device_orientation() -> UseDeviceOrientationReturn {
     cfg_if! { if #[cfg(feature = "ssr")] {
         let is_supported = Signal::derive(|| false);
-        let absolute = || false;
-        let alpha = || None;
-        let beta = || None;
-        let gamma = || None;
+        let absolute = Signal::derive(|| false);
+        let alpha = Signal::derive(|| None);
+        let beta = Signal::derive(|| None);
+        let gamma = Signal::derive(|| None);
     } else {
         use leptos::prelude::*;
         use crate::{use_event_listener_with_options, UseEventListenerOptions, use_supported, js};
diff --git a/src/use_draggable.rs b/src/use_draggable.rs
index 796ba51..43f4893 100644
--- a/src/use_draggable.rs
+++ b/src/use_draggable.rs
@@ -5,8 +5,9 @@ use leptos::ev::{pointerdown, pointermove, pointerup};
 use leptos::prelude::diagnostics::SpecialNonReactiveZone;
 use leptos::prelude::wrappers::read::Signal;
 use leptos::prelude::*;
+use send_wrapper::SendWrapper;
 use std::marker::PhantomData;
-use std::rc::Rc;
+use std::sync::Arc;
 use wasm_bindgen::JsCast;
 use web_sys::PointerEvent;
 
@@ -92,11 +93,12 @@ where
     let target = target.into();
 
     let dragging_handle = if let Some(handle) = handle {
-        let handle = (handle).into();
-        Signal::derive(move || handle.get().map(|handle| handle.into()))
+        // let handle = Signal::derive(|| SendWrapper::new(handle));
+        let handle: ElementMaybeSignal<_, _> = handle.into();
+        Signal::derive(move || handle.get().map(|handle| SendWrapper::new(handle.into())))
     } else {
         let target = target.clone();
-        Signal::derive(move || target.get().map(|target| target.into()))
+        Signal::derive(move || target.get().map(|target| SendWrapper::new(target.into())))
     };
 
     let (position, set_position) = initial_value.into_signal();
@@ -280,13 +282,13 @@ where
     initial_value: MaybeRwSignal<Position>,
 
     /// Callback when the dragging starts. Return `false` to prevent dragging.
-    on_start: Rc<dyn Fn(UseDraggableCallbackArgs) -> bool>,
+    on_start: Arc<dyn Fn(UseDraggableCallbackArgs) -> bool + Send + Sync>,
 
     /// Callback during dragging.
-    on_move: Rc<dyn Fn(UseDraggableCallbackArgs)>,
+    on_move: Arc<dyn Fn(UseDraggableCallbackArgs) + Send + Sync>,
 
     /// Callback when dragging end.
-    on_end: Rc<dyn Fn(UseDraggableCallbackArgs)>,
+    on_end: Arc<dyn Fn(UseDraggableCallbackArgs) + Send + Sync>,
 
     #[builder(skip)]
     _marker1: PhantomData<DragT>,
@@ -306,9 +308,9 @@ impl Default
             handle: None,
             pointer_types: vec![PointerType::Mouse, PointerType::Touch, PointerType::Pen],
             initial_value: MaybeRwSignal::default(),
-            on_start: Rc::new(|_| true),
-            on_move: Rc::new(|_| {}),
-            on_end: Rc::new(|_| {}),
+            on_start: Arc::new(|_| true),
+            on_move: Arc::new(|_| {}),
+            on_end: Arc::new(|_| {}),
             _marker1: PhantomData,
             _marker2: PhantomData,
         }
diff --git a/src/use_drop_zone.rs b/src/use_drop_zone.rs
index 6756866..f10a88d 100644
--- a/src/use_drop_zone.rs
+++ b/src/use_drop_zone.rs
@@ -3,8 +3,9 @@ use cfg_if::cfg_if;
 use default_struct_builder::DefaultBuilder;
 use leptos::prelude::wrappers::read::Signal;
 use leptos::prelude::*;
+use send_wrapper::SendWrapper;
 use std::fmt::{Debug, Formatter};
-use std::rc::Rc;
+use std::sync::Arc;
 
 cfg_if! { if #[cfg(not(feature = "ssr"))] {
     use crate::use_event_listener;
@@ -73,7 +74,7 @@ where
     T: Into<web_sys::EventTarget> + Clone + 'static,
 {
     let (is_over_drop_zone, set_over_drop_zone) = signal(false);
-    let (files, set_files) = signal(Vec::<web_sys::File>::new());
+    let (files, set_files) = signal(Vec::<SendWrapper<web_sys::File>>::new());
 
     #[cfg(not(feature = "ssr"))]
     {
@@ -176,22 +177,22 @@ where
 #[cfg_attr(feature = "ssr", allow(dead_code))]
 pub struct UseDropZoneOptions {
     /// Event handler for the [`drop`](https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/drop_event) event
-    on_drop: Rc<dyn Fn(UseDropZoneEvent)>,
+    on_drop: Arc<dyn Fn(UseDropZoneEvent) + Send + Sync>,
     /// Event handler for the [`dragenter`](https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/dragenter_event) event
-    on_enter: Rc<dyn Fn(UseDropZoneEvent)>,
+    on_enter: Arc<dyn Fn(UseDropZoneEvent) + Send + Sync>,
     /// Event handler for the [`dragleave`](https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/dragleave_event) event
-    on_leave: Rc<dyn Fn(UseDropZoneEvent)>,
+    on_leave: Arc<dyn Fn(UseDropZoneEvent) + Send + Sync>,
     /// Event handler for the [`dragover`](https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/dragover_event) event
-    on_over: Rc<dyn Fn(UseDropZoneEvent)>,
+    on_over: Arc<dyn Fn(UseDropZoneEvent) + Send + Sync>,
 }
 
 impl Default for UseDropZoneOptions {
     fn default() -> Self {
         Self {
-            on_drop: Rc::new(|_| {}),
-            on_enter: Rc::new(|_| {}),
-            on_leave: Rc::new(|_| {}),
-            on_over: Rc::new(|_| {}),
+            on_drop: Arc::new(|_| {}),
+            on_enter: Arc::new(|_| {}),
+            on_leave: Arc::new(|_| {}),
+            on_over: Arc::new(|_| {}),
         }
     }
 }
@@ -214,7 +215,7 @@ pub struct UseDropZoneEvent {
 /// Return type of [`use_drop_zone`].
 pub struct UseDropZoneReturn {
     /// Files being handled
-    pub files: Signal<Vec<web_sys::File>>,
+    pub files: Signal<Vec<SendWrapper<web_sys::File>>>,
     /// Whether the files (dragged by the pointer) are over the drop zone
     pub is_over_drop_zone: Signal<bool>,
 }
diff --git a/src/use_event_source.rs b/src/use_event_source.rs
index dddf76b..e857a10 100644
--- a/src/use_event_source.rs
+++ b/src/use_event_source.rs
@@ -259,9 +259,9 @@ where
             for event_name in named_events.clone() {
                 let _ = use_event_listener(
                     es.clone(),
-                    leptos::ev::Custom::<ev::Event>::new(event_name),
+                    leptos::ev::Custom::<leptos::ev::Event>::new(event_name),
                     move |e| {
-                        set_event.set(Some(e.clone()));
+                        set_event.set(Some(SendWrapper::new(e.clone())));
                         let data_string = js!(e["data"]).ok().and_then(|d| d.as_string());
                         set_data_from_string(data_string);
                     },
diff --git a/src/use_websocket.rs b/src/use_websocket.rs
index 51b657f..2cf593f 100644
--- a/src/use_websocket.rs
+++ b/src/use_websocket.rs
@@ -303,9 +303,11 @@ where
             Some(Arc::new(move || {
                 if !manually_closed_ref.get_value()
                     && !reconnect_limit.is_exceeded_by(reconnect_times_ref.get_value())
-                    && ws_ref.get_value().map_or(false, |ws: SendWrapper<WebSocket>| {
-                        ws.ready_state() != WebSocket::OPEN
-                    })
+                    && ws_ref
+                        .get_value()
+                        .map_or(false, |ws: SendWrapper<WebSocket>| {
+                            ws.ready_state() != WebSocket::OPEN
+                        })
                 {
                     reconnect_timer_ref.set_value(
                         set_timeout_with_handle(
@@ -417,7 +419,7 @@ where
                                                 on_message(&val);
 
                                                 #[cfg(debug_assertions)]
-                                        drop(zone);
+                                                drop(zone);
 
                                                 set_message.set(Some(val));
                                             }
@@ -628,7 +630,7 @@ impl ReconnectLimit {
     }
 }
 
-type ArcFnBytes = Arc<dyn Fn(&[u8])>;
+type ArcFnBytes = Arc<dyn Fn(&[u8]) + Send + Sync>;
 
 /// Options for [`use_websocket_with_options`].
 #[derive(DefaultBuilder)]
@@ -644,7 +646,7 @@ where
     /// `WebSocket` message callback for text.
     on_message_raw: Arc<dyn Fn(&str) + Send + Sync>,
     /// `WebSocket` message callback for binary.
-    on_message_raw_bytes: ArcFnBytes + Send + Sync,
+    on_message_raw_bytes: ArcFnBytes,
     /// `WebSocket` error callback.
     #[builder(skip)]
     on_error: Arc<dyn Fn(UseWebSocketError<E, D>) + Send + Sync>,
diff --git a/src/utils/signal_filtered.rs b/src/utils/signal_filtered.rs
index f397e5e..2763e9e 100644
--- a/src/utils/signal_filtered.rs
+++ b/src/utils/signal_filtered.rs
@@ -15,7 +15,7 @@ macro_rules! signal_filtered {
             ) -> Signal<T>
             where
                 S: Into<Signal<T>>,
-                T: Clone + 'static,
+                T: Clone + Send + Sync + 'static,
             {
                 [<signal_ $filter_name d_with_options>](value, ms, [<$filter_name:camel Options>]::default())
             }
@@ -36,7 +36,7 @@ macro_rules! signal_filtered {
             ) -> Signal<T>
             where
                 S: Into<Signal<T>>,
-                T: Clone + 'static,
+                T: Clone + Send + Sync + 'static,
             {
                 let value = value.into();
                 let ms = ms.into();