diff --git a/SCRUM-Timer/Assets/ringtone001.wav b/SCRUM-Timer/Assets/ringtone001.wav
new file mode 100644
index 0000000..a21b710
Binary files /dev/null and b/SCRUM-Timer/Assets/ringtone001.wav differ
diff --git a/SCRUM-Timer/CountdownTimer.cs b/SCRUM-Timer/CountdownTimer.cs
index ce9d56e..c2d3aa3 100644
--- a/SCRUM-Timer/CountdownTimer.cs
+++ b/SCRUM-Timer/CountdownTimer.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Threading;
 
+
 namespace SCRUM_Timer;
 
 public class CountdownTimer
@@ -9,8 +10,10 @@ public class CountdownTimer
     public bool isRunning;
     private Thread timerThread;
 
+
     public event EventHandler<TimeSpan>? TimeChanged;
-    
+    public event EventHandler? CountdownEndReached;
+
     public CountdownTimer()
     {
         ActualTime = new TimeSpan(0, 5, 0);
@@ -35,9 +38,17 @@ public class CountdownTimer
 
     private void TimerTick()
     {
-        TimeSpan tickTime = new TimeSpan(0,0,1);
+        TimeSpan tickTime = new TimeSpan(0, 0, 1);
         while (isRunning)
         {
+            if (ActualTime == TimeSpan.Zero) //If 00:00:00 reached
+            {
+                isRunning = false;
+                CountdownEndReached?.Invoke(this, null);
+                Console.WriteLine("Timer is stopped");
+                break;
+            }
+
             ActualTime = ActualTime.Subtract(tickTime);
             TimeChanged?.Invoke(this, ActualTime);
             Console.WriteLine(ActualTime);
@@ -58,4 +69,9 @@ public class CountdownTimer
         Console.WriteLine($"Changed Time To: {time}");
         TimeChanged?.Invoke(this, ActualTime);
     }
+
+    private void PlaySound()
+    {
+        
+    }
 }
\ No newline at end of file
diff --git a/SCRUM-Timer/Views/MainWindow.axaml.cs b/SCRUM-Timer/Views/MainWindow.axaml.cs
index a11b7e8..8756e64 100644
--- a/SCRUM-Timer/Views/MainWindow.axaml.cs
+++ b/SCRUM-Timer/Views/MainWindow.axaml.cs
@@ -19,7 +19,7 @@ public partial class MainWindow : Window
             Dispatcher.UIThread.Post(() => { TimeText.Text = ts.ToString(@"hh\:mm\:ss"); });
         };
 
-        // Startwert anzeigen
+        // Show time
         TimeText.Text = countdownTimer.ActualTime.ToString(@"hh\:mm\:ss");
     }
 
diff --git a/SCRUM-Timer/bin/Debug/net9.0/SCRUM-Timer.dll b/SCRUM-Timer/bin/Debug/net9.0/SCRUM-Timer.dll
index a5a60ac..1655680 100644
Binary files a/SCRUM-Timer/bin/Debug/net9.0/SCRUM-Timer.dll and b/SCRUM-Timer/bin/Debug/net9.0/SCRUM-Timer.dll differ
diff --git a/SCRUM-Timer/bin/Debug/net9.0/SCRUM-Timer.pdb b/SCRUM-Timer/bin/Debug/net9.0/SCRUM-Timer.pdb
index 2e6f2d3..017af49 100644
Binary files a/SCRUM-Timer/bin/Debug/net9.0/SCRUM-Timer.pdb and b/SCRUM-Timer/bin/Debug/net9.0/SCRUM-Timer.pdb differ
diff --git a/SCRUM-Timer/obj/Debug/net9.0/SCRUM-Timer.AssemblyInfo.cs b/SCRUM-Timer/obj/Debug/net9.0/SCRUM-Timer.AssemblyInfo.cs
index c9ace8b..a140b87 100644
--- a/SCRUM-Timer/obj/Debug/net9.0/SCRUM-Timer.AssemblyInfo.cs
+++ b/SCRUM-Timer/obj/Debug/net9.0/SCRUM-Timer.AssemblyInfo.cs
@@ -13,7 +13,7 @@ using System.Reflection;
 [assembly: System.Reflection.AssemblyCompanyAttribute("SCRUM-Timer")]
 [assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
 [assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
-[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+c75571d37f7336dfb52fed9dc6d68bf9b9f45b5b")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+61d34a07322c12eda04f3d0b42138bdbcbfecb60")]
 [assembly: System.Reflection.AssemblyProductAttribute("SCRUM-Timer")]
 [assembly: System.Reflection.AssemblyTitleAttribute("SCRUM-Timer")]
 [assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
diff --git a/SCRUM-Timer/obj/Debug/net9.0/SCRUM-Timer.AssemblyInfoInputs.cache b/SCRUM-Timer/obj/Debug/net9.0/SCRUM-Timer.AssemblyInfoInputs.cache
index c886e7b..f6ba7cc 100644
--- a/SCRUM-Timer/obj/Debug/net9.0/SCRUM-Timer.AssemblyInfoInputs.cache
+++ b/SCRUM-Timer/obj/Debug/net9.0/SCRUM-Timer.AssemblyInfoInputs.cache
@@ -1 +1 @@
-9c6fe80198f5371ea3d3b92476d3d3b511441274fad1a2af08f329e71215972b
+ab040ed544ed55e89cafba8bf0618c74dc63a5fcd550dd04c456f26224f4ed78
diff --git a/SCRUM-Timer/obj/Debug/net9.0/SCRUM-Timer.dll b/SCRUM-Timer/obj/Debug/net9.0/SCRUM-Timer.dll
index a5a60ac..1655680 100644
Binary files a/SCRUM-Timer/obj/Debug/net9.0/SCRUM-Timer.dll and b/SCRUM-Timer/obj/Debug/net9.0/SCRUM-Timer.dll differ
diff --git a/SCRUM-Timer/obj/Debug/net9.0/SCRUM-Timer.pdb b/SCRUM-Timer/obj/Debug/net9.0/SCRUM-Timer.pdb
index 2e6f2d3..017af49 100644
Binary files a/SCRUM-Timer/obj/Debug/net9.0/SCRUM-Timer.pdb and b/SCRUM-Timer/obj/Debug/net9.0/SCRUM-Timer.pdb differ
diff --git a/SCRUM-Timer/obj/Debug/net9.0/ref/SCRUM-Timer.dll b/SCRUM-Timer/obj/Debug/net9.0/ref/SCRUM-Timer.dll
index c90cad6..558e24c 100644
Binary files a/SCRUM-Timer/obj/Debug/net9.0/ref/SCRUM-Timer.dll and b/SCRUM-Timer/obj/Debug/net9.0/ref/SCRUM-Timer.dll differ
diff --git a/SCRUM-Timer/obj/Debug/net9.0/refint/SCRUM-Timer.dll b/SCRUM-Timer/obj/Debug/net9.0/refint/SCRUM-Timer.dll
index c90cad6..558e24c 100644
Binary files a/SCRUM-Timer/obj/Debug/net9.0/refint/SCRUM-Timer.dll and b/SCRUM-Timer/obj/Debug/net9.0/refint/SCRUM-Timer.dll differ