diff --git a/CommandHandler.cs b/CommandHandler.cs
index 98d0f01..6565244 100644
--- a/CommandHandler.cs
+++ b/CommandHandler.cs
@@ -8,8 +8,13 @@ namespace DualScreenDemo
     public class CommandHandler
     {
         public static bool readyForSongListInput = false;
+        /* 關機 queue */
         private readonly int _maxHistoryLength = 6; // 最多保留 6 筆
         private readonly Queue<string> _indataHistory = new Queue<string>();
+        
+        private int _wrongInputCountfor62 = 0; // 錯誤輸入計數器
+        private int _wrongInputCountfor61 = 0; // 錯誤輸入計數器
+        private const int MaxWrongLimit = 3; // 錯誤輸入限制次數
         private readonly SongListManager songListManager;
 
         public CommandHandler(SongListManager songListManager)
@@ -332,7 +337,16 @@ namespace DualScreenDemo
                         else
                         {
                             ClearDisplay();
-                            OverlayForm.MainForm.displayLabel.Text = "輸入錯誤!!!";
+                            _wrongInputCountfor61++;
+                            if(_wrongInputCountfor61 <= MaxWrongLimit)
+                            {
+                                OverlayForm.MainForm.displayLabel.Text += "#";
+                            }
+                            else
+                            {
+                                OverlayForm.MainForm.displayLabel.Text = "輸入錯誤!!!";
+                                _wrongInputCountfor61 = 0; // 重置計數器
+                            }
                             OverlayForm.MainForm.nextSongLabel.Visible = false;
                             OverlayForm.displayTimer.Start();
                         }
@@ -351,7 +365,16 @@ namespace DualScreenDemo
                     else
                     {
                         ClearDisplay();
-                        OverlayForm.MainForm.displayLabel.Text = "輸入錯誤!!!";
+                        _wrongInputCountfor61++;
+                            if(_wrongInputCountfor61 <= MaxWrongLimit)
+                            {
+                                OverlayForm.MainForm.displayLabel.Text += "#";
+                            }
+                            else
+                            {
+                                OverlayForm.MainForm.displayLabel.Text = "輸入錯誤!!!";
+                                _wrongInputCountfor61 = 0; // 重置計數器
+                            }
                         OverlayForm.MainForm.nextSongLabel.Visible = false;
                         OverlayForm.displayTimer.Start();
                     }
@@ -404,7 +427,16 @@ namespace DualScreenDemo
                         else
                         {
                             ClearDisplay();
-                            OverlayForm.MainForm.displayLabel.Text = "輸入錯誤!!!";
+                            _wrongInputCountfor62++;
+                            if(_wrongInputCountfor62 <= MaxWrongLimit)
+                            {
+                                OverlayForm.MainForm.displayLabel.Text += "*";
+                            }
+                            else
+                            {
+                                OverlayForm.MainForm.displayLabel.Text = "輸入錯誤!!!";
+                                _wrongInputCountfor62 = 0; // 重置計數器
+                            }
                             OverlayForm.MainForm.nextSongLabel.Visible = false;
                             OverlayForm.displayTimer.Start();
                         }
@@ -421,7 +453,16 @@ namespace DualScreenDemo
                     else
                     {
                         ClearDisplay();
-                        OverlayForm.MainForm.displayLabel.Text = "輸入錯誤!!!";
+                        _wrongInputCountfor62++;
+                            if(_wrongInputCountfor62 <= MaxWrongLimit)
+                            {
+                                OverlayForm.MainForm.displayLabel.Text += "*";
+                            }
+                            else
+                            {
+                                OverlayForm.MainForm.displayLabel.Text = "輸入錯誤!!!";
+                                _wrongInputCountfor62 = 0; // 重置計數器
+                            }
                         OverlayForm.MainForm.nextSongLabel.Visible = false;
                         OverlayForm.displayTimer.Start();
                     }