[Name] USB Rechargeable Rear Lamp [Power] Lithium Battery [Color] Red Light, White Light, Blue Light [Lamp Holder] Super Bright LED Lamp Holder [Mode] Always Bright, Slow Cycle, Flash, fast Cycle [Applicable Pipe Diameter] Suitable for Seat Tube Within 4cm [Use Time] Charging Duration Is 2 Hours, Use Duration Is up to 6 Hours [Features] High Brightness LED Lamp, Use Rechargeable Lithium Polymer Battery, automatic Fully Charged Cut-off System, Smooth and Stylish Design, Sealed and Waterproof. The Slender and Neat Shape Is Matched with the Prism-Shaped Channel Beam Column Design, and the Ultra Wide-Angle Irradiation Range Provides More Safety Protection. The Newly Designed Elastic Straps Is Firmly Installed on Various Car Bodies with Different Shapes and Diameters.