YISUIPU Smart Rear Bike Light, Brake Sensing Bike Tail Light, Auto On/Off, Waterproof (Intelligent Brake Tail Light)High performance: The bicycle taillight is equipped with an 800 mAh battery. The longest battery life can be up to 35 hours, and it also has an IPX5 waterproof rating, which can withstand various harsh weather conditions and provide r..