[Brake Sensitivity] In any mode, you can sensitively capture the brake status of the bike through vibration detection. The built-in brake sensor automatically illuminates to full brightness when is detected. Greatly improved security. [USB-C rechargeable] XR01 adopts USB-C interface, which can be fully quickly. It can be fully in about 1 hour and can be used for 7 to 16 hours. The maximum waiting time is 3 months. [Innovative Optical Lens] The bright LED is bright but not dazzling, so you don't have to worry about disturbing passers-by. [IPX6 Waterproof Level] The surface is treated with imitation carbon fiber texture to prevent water from entering. You can continue to use it even when it heavily. [Easy to Install] Support 2 different installation methods, compatible with most bike models. No tools required. color: Black material: plastic Package Contents: 1 x Bike Tail Light 1 x USB Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.