Features： 1、1. 3 Lighting modes: Fast/50h, breathing flash/30h, constant lighting mode/25h for bicycle tail lights. (Warning: If there is no vibration for 30 seconds after parking, the light will turn off; when vibration is felt, the light will turn on automatically.) 2、 2. IPX65 Waterproof: The tail light is waterproof, so it is not necessary to remove it from the car when it rains or cleans the bicycle. 3、 3. Lightweight design: The bicycle taillight weighs only 50 grams. Aluminum alloy shell, resistant to scratches and drops. The front panel switch can be turned on with a button. 4、 4. Easy installation: Both installation methods are possible and very easy. The optimal width of the saddle is about 38±2 mm, and it can also be fixed with a belt. 5、 5. USB charging: The USB charging port is located inside the rear cover of the taillight. Its compact design prevents the USB charging port from getting wet. You can use the power bank and charger to charge the taillights. Specification： Material: Aluminum alloy Battery: Rechargeable battery Charging: USB charging interface LED: high lumen COB Function: Intelligent induction, automatic stop and start, brake warning, IP65 high water imitation, power display Package List： 1* Bicycle taillight 1* Base 1* USB cable