diff --git a/src/beep.rs b/src/beep.rs
index e295ccd..82f7b59 100644
--- a/src/beep.rs
+++ b/src/beep.rs
@@ -53,23 +53,23 @@ impl Beep {
     pub fn play(&mut self, ringtone: ringtone::Type) -> anyhow::Result<()> {
         if self.state.ringtone != ringtone {
             self.state = BeepState::from_ringtone(ringtone);
+            info!("change: {:?}", ringtone);
+        } else {
+            return Ok(());
         }
         let state = Arc::new(Mutex::new(self.state));
         let mut timer = EspTimerService::new()?.timer(move || {
-            info!("One-shot timer triggered");
             match state.lock().as_mut() {
                 Ok(state) => {
-                    info!("B state.beat: {}", state.beat);
                     if let Err(err) = Self::play_once(state) {
                         warn!("{}", err);
                     }
-                    info!("A state.beat: {}", state.beat);
                 }
                 Err(err) => {
                     warn!("Failed to lock state. {}", err);
                 }
             }
-        })?;
+        }).map_err(|err| anyhow::anyhow!("Init Timer Failed. {}", err))?;
         timer.every(Duration::from_millis(250))?;
 
         self.watch_timer = Some(timer);
@@ -82,6 +82,9 @@ impl Beep {
             .map_err(|err| anyhow::anyhow!("Failed to set GPIO 4 as ledc output. {}", err))?;
         let hw_timer = unsafe { TIMER0::new() };
         let hw_channel = unsafe { CHANNEL0::new() };
+        if state.ringtone.len() <= state.beat as usize {
+            state.beat = 0;
+        }
         let curr = state.ringtone[state.beat as usize];
         let mut channel = Self::init_channel(pin, hw_timer, hw_channel, if curr < 1000 { 1000.Hz().into()} else  {curr.Hz().into()} )
             .map_err(|err| anyhow::anyhow!("Failed to initialize channel. {}", err))?;
@@ -101,8 +104,8 @@ impl Beep {
 }
 pub mod ringtone {
     pub type Type = [u32; 16];
-    pub const ADAPTER_DOWN: Type = [2000, 1950, 1900, 1800, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
-    pub const BATTERY_LOW: Type = [2000, 1950, 0, 0, 1930, 1900, 0, 0, 2000, 1900, 0, 0, 1930, 1900, 0, 0];
+    pub const ADAPTER_DOWN: Type = [2300, 2000, 2250, 1950, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
+    pub const BATTERY_LOW: Type = [2000, 1950, 0, 0, 1980, 1900, 0, 0, 2000, 1900, 0, 0, 1980, 1900, 0, 0];
     pub const SILENCE: Type = [0; 16];
-    pub const SHUTDOWN: Type = [2300, 0, 2300, 2000, 2100, 2000, 0, 2300, 2000, 2100, 2000, 1900, 0, 0, 0, 0];
+    pub const SHUTDOWN: Type = [3450, 3500, 0, 3500, 3050, 3000, 0, 3000, 3050, 1000, 1000, 1000, 0, 0, 0, 0];
 }
diff --git a/src/main.rs b/src/main.rs
index fddf1e1..047732d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -60,7 +60,29 @@ fn main() {
         blink.play();
     });
     let mut beep = Beep::new();
-    beep.play(ringtone::ADAPTER_DOWN).expect("Can not beep.");
+
+    let _subscription;
+    if let Some(eventloop) = unsafe { EVENTLOOP.as_mut() } {
+        _subscription = eventloop
+            .subscribe(move |message: &VoltageDetectionWorker| {
+                info!("Event Loop Value");
+                if let Ok(json_str) = serde_json::to_string(&message) {
+                    if let Err(err) = mq.publish("voltage", json_str.as_bytes()) {
+                        warn!("Can not publish message to MQTT. {}", err);
+                    }
+                }
+
+                if message.battery_voltage < 1000 {
+                    beep.play(ringtone::BATTERY_LOW).expect("Can not beep.");
+                } else if message.adapter_voltage < 1000 {
+                    beep.play(ringtone::ADAPTER_DOWN).expect("Can not beep.");
+                } else {
+                    beep.play(ringtone::SILENCE).expect("Can not beep.");
+                }
+            })
+            .expect(" Listening Event Loop Failed");
+    }
+
 
     let mut voltage_detection = VoltageDetection::new();
 
@@ -75,21 +97,6 @@ fn main() {
 
     let mut time = Time::new();
     time.sync().unwrap();
-
-    let _subscription;
-    if let Some(eventloop) = unsafe { EVENTLOOP.as_mut() } {
-        _subscription = eventloop
-            .subscribe(move |message: &VoltageDetectionWorker| {
-                info!("Event Loop Value");
-                if let Ok(json_str) = serde_json::to_string(&message) {
-                    if let Err(err) = mq.publish("voltage", json_str.as_bytes()) {
-                        warn!("Can not publish message to MQTT. {}", err);
-                    }
-                }
-            })
-            .expect(" Listening Event Loop Failed");
-    }
-
     loop {
         sleep(Duration::from_millis(1000));
     }
diff --git a/src/voltage_detection.rs b/src/voltage_detection.rs
index c37fd78..959fdef 100644
--- a/src/voltage_detection.rs
+++ b/src/voltage_detection.rs
@@ -55,7 +55,6 @@ impl VoltageDetection {
     pub fn watching(&mut self) -> anyhow::Result<()> {
         let worker = Arc::new(Mutex::new(self.worker));
         let mut timer = EspTimerService::new()?.timer(move || {
-            info!("One-shot timer triggered");
             match worker.lock().as_mut() {
                 Ok(worker) => {
                     if let Err(err) = worker.read_once() {