① Overheat protection: When the device run out of the content, it will stop working and keep flashing 3 seconds.
When the device is continuously used for more than 12 seconds, lights will flash 8 times and stop working.
② Short circuit protection: All lights will flash 3 times to indicate short circuit and will automatically shut off.
③ Low voltage protection: All lights will flash 5 times to indicate low voltage. The device will automatically stop working for protection.
④ Overcharge protection: When the device is full charged, it will automatically stop charging.