Smart taillight: The taillights have brake sensing function. When the taillight detects brake deceleration, it will switch to brake light mode. The taillights emit strong light. Improve cycling safety . _x000D_ Intelligent induction taillight: In slow flash mode and breathing light mode, turn on the taillight switch. If you are driving in a dark environment, the rear lights will automatically turn on. _x000D_ Waterproof taillights: The taillights are IP65 waterproof. On rainy , the rear lights can be used normally. _x000D_ USB Charging: This is a USB charging light. It can be charged via a variety of USB devices. _x000D_ A variety of installation methods: There are 2 installation methods. It can be mounted under the seat. It can also be mounted on the vertical pipe. It can be installed in any suitable place. _x000D_ _x000D_ Smart brake tail light _x000D_ Once braking deceleration is detected, the rear light will increase in brightness to alert vehicles and pedestrians behind. _x000D_ _x000D_ Intelligent light perception _x000D_ When the light beam of the bicycle taillight is in slow flash mode or breathing light mode. If you are driving in a dark environment, the taillights will turn on automatically. After leaving the dark room, if the bike does not_x000D_vibrate for 30 seconds, the rear lights will automatically turn off. _x000D_ _x000D_ 4 Lighting Modes _x000D_ This rear light has 4 lighting modes. You can have a variety of options. Light mode: slow flash mode, breathing light mode, constant light mode, off mode. _x000D_ USB Charging _x000D_ The rear lights are charged via USB. It can be charged via a variety of USB devices. The rear lights have 4 blue LED power indicators. Battery status is clearly visible. _x000D_ _x000D_ Waterproof tail light _x000D_ The rear lights are IP65 waterproof. On rainy , the rear lights can be used normally. _x000D_ _x000D_ 2 Installation Methods _x000D_ Taillights are available in two mounting styles. It can be mounted under the seat or on the seatpost. _x000D_ Product Parameters _x000D_ Model: smart tail light _x000D_ Charging: USB charging _x000D_ Battery: 3.7V / 400mAh _x000D_ LED: high lumen COB