Intelligent warning light: The bicycle taillights have an intelligent alarm function. After the taillight sets the alarm mode, if the taillight detects vibration, it will alarm. The alarm sound is 105-120 dB. It can make your bike safer.Wireless taillight: Taillight with a wireless remote control. The remote control distance is 0-50 meters. In the dark, you can quickly find your bike with the remote control.Waterproof function: IP5 waterproof. New quality ABS material. Perfect 360 seal. On rainy days, the rear lights can be used normally.USB charging: The rear lights are charged via USB. It can be charged via a variety of USB devices.Hidden installation: the rear lights can be mounted inside the saddle. Easy to install.