1. The system starts working and the LED light turns on.
2. If the single service time is longer than 15 seconds, the system will stop power transmission automatically and the LED light becomes flashing.
3. The LED light will blink successively in case of under voltage, which means that batteries are in badly need of recharging.
4. When charging, the LED light will turn lit and it will become dark when the batteries are fully recharged.
5. The product can charge through the USB interface by charging cable or interface.
6. Take off the watch when sleeping to prevent the unnecessary ​occurrence.