diff --git a/firmware.bin b/firmware.bin
index de2a74a..d4e133d 100644
Binary files a/firmware.bin and b/firmware.bin differ
diff --git a/firmware.packed.bin b/firmware.packed.bin
index f04b959..188b714 100644
Binary files a/firmware.packed.bin and b/firmware.packed.bin differ
diff --git a/functions.c b/functions.c
index f5a83e9..0ec5dfb 100644
--- a/functions.c
+++ b/functions.c
@@ -267,7 +267,7 @@ void FUNCTION_Select(function_type_t Function)
 				if (g_current_vfo->channel.mdc1200_mode == MDC1200_MODE_BOT || g_current_vfo->channel.mdc1200_mode == MDC1200_MODE_BOTH)
 				{
 					#ifdef ENABLE_MDC1200_SIDE_BEEP
-						BK4819_StartTone1(880, 50, false);
+						BK4819_StartTone1(880, 20, false);
 						SYSTEM_DelayMs(120);
 						BK4819_StopTones(true);
 					#endif
@@ -275,7 +275,7 @@ void FUNCTION_Select(function_type_t Function)
 					BK4819_send_MDC1200(MDC1200_OP_CODE_PTT_ID, 0x80, g_eeprom.config.setting.mdc1200_id);
 
 					#ifdef ENABLE_MDC1200_SIDE_BEEP
-						BK4819_StartTone1(880, 50, false);
+						BK4819_StartTone1(880, 20, false);
 						SYSTEM_DelayMs(120);
 						BK4819_StopTones(true);
 					#endif
diff --git a/radio.c b/radio.c
index ea48571..02ea570 100644
--- a/radio.c
+++ b/radio.c
@@ -1213,7 +1213,7 @@ void RADIO_tx_eot(void)
 	if (g_current_vfo->channel.mdc1200_mode == MDC1200_MODE_EOT || g_current_vfo->channel.mdc1200_mode == MDC1200_MODE_BOTH)
 	{
 		#ifdef ENABLE_MDC1200_SIDE_BEEP
-			//BK4819_StartTone1(880, 50, false);
+			//BK4819_StartTone1(880, 20, false);
 			//SYSTEM_DelayMs(120);
 			//BK4819_StopTones(true);
 		#endif
@@ -1221,7 +1221,7 @@ void RADIO_tx_eot(void)
 		BK4819_send_MDC1200(MDC1200_OP_CODE_POST_ID, 0x00, g_eeprom.config.setting.mdc1200_id);
 
 		#ifdef ENABLE_MDC1200_SIDE_BEEP
-			BK4819_StartTone1(880, 50, false);
+			BK4819_StartTone1(880, 20, false);
 			SYSTEM_DelayMs(120);
 			BK4819_StopTones(true);
 		#endif