diff --git a/PrimaryFormParts/PrimaryForm.SyncScreen.cs b/PrimaryFormParts/PrimaryForm.SyncScreen.cs
index 67d3651..78ef0d0 100644
--- a/PrimaryFormParts/PrimaryForm.SyncScreen.cs
+++ b/PrimaryFormParts/PrimaryForm.SyncScreen.cs
@@ -49,11 +49,11 @@ namespace DualScreenDemo
 
             
             
-            
+            //同步畫面 服務鈴
             ConfigureButton(this.syncServiceBellButton, 1240, 17, 161, 161, 
                 resizedNormalStateImageForSyncScreen, resizedNormalStateImageForSyncScreen, resizedNormalStateImageForSyncScreen, 
-                (sender, e) => SendCommandThroughSerialPort("a2 53 a4"));
-            
+                //(sender, e) => SendCommandThroughSerialPort("a2 53 a4"));
+                (sender,e)=>OnServiceBellButtonClick(sender,e));
             
             
             
diff --git a/PrimaryFormParts/PrimaryForm.cs b/PrimaryFormParts/PrimaryForm.cs
index 1b0d96c..7cbda55 100644
--- a/PrimaryFormParts/PrimaryForm.cs
+++ b/PrimaryFormParts/PrimaryForm.cs
@@ -370,7 +370,7 @@ namespace DualScreenDemo
 
             // 顯示包廂名稱
             // 取主機名稱的最後 20 個字元 (如果長度不足 20，則取全部)
-            string displayName = "包廂" + hostName.Substring(Math.Max(0, hostName.Length - 20));
+            string displayName = "包廂" + hostName.Substring(Math.Max(0, hostName.Length - 3));
             string totalPages = multiPagePanel.totalPages.ToString() == "0" ? "1" : multiPagePanel.totalPages.ToString();
             string pageNumber = (multiPagePanel.currentPageIndex + 1).ToString() + "/" + totalPages;
             
@@ -3321,6 +3321,7 @@ public class MultiPagePanel : Panel
 
         
         private bool isWaiting = false;
+        // 服務鈴事件
         private async void OnServiceBellButtonClick(object sender, EventArgs e)
         {
             if (isWaiting) return;
@@ -3499,7 +3500,7 @@ public class MultiPagePanel : Panel
             float scaledFontSize = 84f * scaleY;
 
             string hostName = System.Net.Dns.GetHostName();
-            string displayName = "包廂" + hostName.Substring(Math.Max(0, hostName.Length - 20));
+            string displayName = "包廂" + hostName.Substring(Math.Max(0, hostName.Length - 3));
 
             using (Font font = new Font("微軟正黑體", scaledFontSize, FontStyle.Bold))
             using (Brush brush = new SolidBrush(Color.Red))