Usb Rechargeable Smart Bike Tail Light Ultra Bright Brake Sensing Rear Bike Light The product is shipped based on the color or size of the main image of the product page. ?High visibility and security?200-300M,Ultra-high brightness and wide-angle view provide extremely bright lighting for the rear. It shines on the road so that you can be easily recognized by others. It ensures greater safety and help you keep away from many accidents. Bicycle rear light has a built-in high-precision sensor and a depth algorithm that can quickly recognize the rear light even when braking lightly.?Long battery life and 6 lighting modes?Rear bike lights can be charged by USB connection. After fully charged, the battery can work for at least 11 hours at maximum brightness. While driving, if the ambient light is dark, the taillight will light up automatically, and when the ambient light is bright, the taillight will automatically go out after 30 seconds. 6 lighting modes you can set freely.?Converse freely between manual mode and auto mode?In manual mode, the lights are switched on and off manually, and the bicycle lights have a brake induction function.If you ride at night,you can set manual mode so that it can light always. In auto mode, the light sensor starts and stops automatically,and when the bike moves,starts, stops or brakes, the light will detect.?High quality and IPX6 waterproof?taillights is made of very durable aerometal,so you can enjoy your cycling best.This rear bike light has passed the CE-EMC / FCC / PSE / ROHS / GB7000 quality inspection report and the IPX6 waterproof report. This bicycle light has a high IPX6 water resistance. So you can use it securely on rainy days.?Easy to install and versatile Cycle? Lights can be installed on seatpost or seat. It's light but strong,so it won't drop and influence your cycling-life. We offer: taillights, straps and brackets, EVA seat loop, pillow brackets, USB charging cable, cable ties, pillow attachment screws, instructions.We have the best customer service, you can contact us if you have any questions.