Auto Brake Rear Light has a built-in 1400 mAh rechargeable polymer battery, and the battery life is about 28 hours in long-on mode (depending on the light mode). It comes with a Type-C USB charging cableQuick installation or removal. Waterproof Bike Saftety Warning USB Night Lamp can be easily removed in a few seconds without tools, and it can be easily removed from the holder cover for chargingIntelligent Induction Brake Tail Lamp has 7 different working modes, 5 lighting modes (long light, flashing, double flashing, Brake and light control) and 2 automatic modes (brake and falling light alarm). With high brightness and clear visibility, it improves the visibility and safety while drivingBike Waterproof LED Tail Light has a brake sensor that can adapt to angle correction and quick response, and a light sensor that can adapt to brightness. In the automatic mode, the smart bicycle taillights are automatically turned on when braking or low-brightness driving is detected, and automatically turned off when high-brightness driving is detectedThe well-designed and compact design makes the Cycle Tail Light look very cool and delicate. The sturdy structure makes the flashlight have high quality and durability. IP66 waterproof rating can ensure safe driving in inclement weather and surrounding environment