Lexin bracelet charging vibration two times and then lost

Is it normal to ask "Is it normal for the Lexin bracelet to charge and vibrate twice and then stop"? It's normal. After a full charge, the Lexin bracelet will vibrate twice to indicate that charging is complete. This vibration can help users confirm whether the bracelet is charging properly and know when charging is complete, which is a normal phenomenon. Guangdong Lexin Medical Electronics Co., Ltd. was founded in 2002 and is headquartered in Zhongshan, Guangdong Province.