Mini Bike Brake Light Intelligent Sensory Bicycle Tail Rear Light USB Charging Bike Taillight Lamp blackKey Features...Super bright signal light, motion sensing + COB LED, automatic open or shutdown.Smart brake induction, IPX6 waterproof, low battery tips, 20 + hours of battery standby time, with strong function.Power saving, USB interface charging, can charge and discharge circulatory.Suitable fo..