diff --git a/APP/main.c b/APP/main.c
index 63d2b4e..4f55da7 100644
--- a/APP/main.c
+++ b/APP/main.c
@@ -151,7 +151,6 @@ static void mf_process_interval_key(key_t *key) {
   this_device.ozone_module = intermittentMode;
   this_device.time_led_num = 0;
   mf_led_rgb_set(false, false, false);
-  stopwork();
   return;
 }
 
@@ -184,6 +183,9 @@ void device_time_process() {
     if (systicket_haspassedms(this_device.time_led_start_time) > 5000) {
       this_device.time_led_start_time = systicket_get_now_ms();
       this_device.time_led_num = this_device.time_led_num - 1;
+      if (this_device.time_led_num == 0) {
+        powerdown();
+      }
     }
   }
 }