1.When the camera is off, long press the SYNC button for 2 seconds. When the blue light flashes, it means that the camera is turned on successfully. Then you'll hear the power on bell.
2.When the camera is on, long press the SYNC button for 15 seconds. You will first see the blue indicator light flashing. At this time, do not release the button until you see the red indicator light, indicating successful shutdown. Then you'll hear the power off bell.