diff --git a/src/components/app/app.tsx b/src/components/app/app.tsx
index 7a713fb..713e24a 100644
--- a/src/components/app/app.tsx
+++ b/src/components/app/app.tsx
@@ -14,6 +14,7 @@ import { Toolbar } from '@/components/toolbar';
 import { SnackbarProvider } from '@/contexts/snackbar';
 
 import { sounds } from '@/data/sounds';
+import { FADE_OUT } from '@/constants/events';
 
 import type { Sound } from '@/data/types';
 import { subscribe } from '@/lib/event';
@@ -57,7 +58,7 @@ export function App() {
   }, []);
 
   useEffect(() => {
-    const unsubscribe = subscribe('fadeOut', (e: { duration: number }) => {
+    const unsubscribe = subscribe(FADE_OUT, (e: { duration: number }) => {
       lock();
 
       setTimeout(() => {
diff --git a/src/components/modals/sleep-timer/sleep-timer.tsx b/src/components/modals/sleep-timer/sleep-timer.tsx
index 22d64fa..08fdb4b 100644
--- a/src/components/modals/sleep-timer/sleep-timer.tsx
+++ b/src/components/modals/sleep-timer/sleep-timer.tsx
@@ -5,6 +5,7 @@ import { Timer } from '@/components/timer';
 import { dispatch } from '@/lib/event';
 import { useSoundStore } from '@/store';
 import { cn } from '@/helpers/styles';
+import { FADE_OUT } from '@/constants/events';
 
 import styles from './sleep-timer.module.css';
 
@@ -58,7 +59,7 @@ export function SleepTimerModal({ onClose, show }: SleepTimerModalProps) {
     if (timeLeft === 0) {
       setRunning(false);
       // pause();
-      dispatch('fadeOut', { duration: 1000 });
+      dispatch(FADE_OUT, { duration: 1000 });
 
       setTimeSpent(0);
 
diff --git a/src/constants/events.ts b/src/constants/events.ts
new file mode 100644
index 0000000..9317274
--- /dev/null
+++ b/src/constants/events.ts
@@ -0,0 +1,2 @@
+export const FADE_OUT = 'FADE_OUT';
+export const CLOSE_MODALS = 'CLOSE_MODALS';
diff --git a/src/hooks/use-sound.ts b/src/hooks/use-sound.ts
index 135b6e1..37e3779 100644
--- a/src/hooks/use-sound.ts
+++ b/src/hooks/use-sound.ts
@@ -4,6 +4,7 @@ import { Howl } from 'howler';
 import { useLoadingStore } from '@/store';
 import { subscribe } from '@/lib/event';
 import { useSSR } from './use-ssr';
+import { FADE_OUT } from '@/constants/events';
 
 export function useSound(
   src: string,
@@ -78,7 +79,7 @@ export function useSound(
   useEffect(() => {
     const listener = (e: { duration: number }) => fadeOut(e.duration);
 
-    return subscribe('fadeOut', listener);
+    return subscribe(FADE_OUT, listener);
   }, [fadeOut]);
 
   const control = useMemo(
diff --git a/src/lib/modal.ts b/src/lib/modal.ts
index 0931cfc..f7a550c 100644
--- a/src/lib/modal.ts
+++ b/src/lib/modal.ts
@@ -1,11 +1,12 @@
 import { dispatch, subscribe } from './event';
+import { CLOSE_MODALS } from '@/constants/events';
 
 export function closeModals() {
-  dispatch('closeModals');
+  dispatch(CLOSE_MODALS);
 }
 
 export function onCloseModals(listener: () => void) {
-  const unsubscribe = subscribe('closeModals', listener);
+  const unsubscribe = subscribe(CLOSE_MODALS, listener);
 
   return unsubscribe;
 }