diff --git a/src/drivers/battery/battery_adc.c b/src/drivers/battery/battery_adc.c
index ec7cb7f..22aaba8 100644
--- a/src/drivers/battery/battery_adc.c
+++ b/src/drivers/battery/battery_adc.c
@@ -167,8 +167,8 @@ static void battery_work_handler(struct k_work *work)
         if (low_battery_cnt >= BATTERY_MONITOR_LIMIT_COUNT)
         {
             low_battery_cnt = 0;
-            DBG_PRINTF("[BATT] %ux low -> Power OFF\r\n", BATTERY_MONITOR_LIMIT_COUNT);
-            sleep_mode_enter();
+            DBG_ERR("[BATT] %ux low -> Power OFF\r\n", BATTERY_MONITOR_LIMIT_COUNT);
+            sleep_mode_enter_reason("battery-low");
             return;
         }
     }
@@ -197,8 +197,8 @@ static void battery_work_handler(struct k_work *work)
         if (high_temperature_cnt >= BATTERY_MONITOR_LIMIT_COUNT)
         {
             high_temperature_cnt = 0;
-            DBG_PRINTF("[TEMP] %ux high -> Power OFF\r\n", BATTERY_MONITOR_LIMIT_COUNT);
-            sleep_mode_enter();
+            DBG_ERR("[TEMP] %ux high -> Power OFF\r\n", BATTERY_MONITOR_LIMIT_COUNT);
+            sleep_mode_enter_reason("temperature-high");
             return;
         }
     }
diff --git a/src/main.h b/src/main.h
index 5c9de4e..c78a100 100644
--- a/src/main.h
+++ b/src/main.h
@@ -63,7 +63,9 @@ typedef enum
  *============================================================================*/
 
 void sleep_mode_enter(void);
+void sleep_mode_enter_reason(const char *reason);
 void device_power_off(void);
+void device_power_keep_on(void);
 void power_button_suspend(bool suspend);
 
 /*==============================================================================
diff --git a/src/parser.c b/src/parser.c
index 3c43b0b..9069652 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -720,7 +720,7 @@ static int cmd_msq(const uint8_t *data, uint8_t data_len)
     }
 
     DBG_PRINTF("[CMD] msq -> power off\r\n");
-    sleep_mode_enter();
+    sleep_mode_enter_reason("cmd-msq");
     return 1;
 }
 
@@ -821,7 +821,6 @@ static int cmd_mdf(const uint8_t *data, uint8_t data_len)
     return 1;
 }
 
-/* msp? → IMU 1회 측정 → rsp: + accel XYZ + gyro XYZ (각 int16 빅엔디안) */
 static int cmd_msp(const uint8_t *data, uint8_t data_len)
 {
     ARG_UNUSED(data);