Features:  3W USB Rechargeable Rear Bicycle Light WaterProof Taillight.  3W red LED as light source, high illumination.  Coupled with crystal-class spotlight cover, light visual distance.  Wide viewing angle of 180 °, fully protect your riding safety.  Visual warning at long distance or fog weather.  3.7V,800mAh Li-polymer battery embedded, USB Rechargeable.  Angle adjustable,quick release mount, vertical or horizontal install.  Rain water proof design,button switch and USB charging interface with expansive rubber cover, rainy ride safe and worry-free.    Specifications: Material: ABS plastic, electronic devices;  Color: Red Light;  Size: 6x4x2.6(L*W*H);  Light source: 1*3W LED chip;  Beam Angle: 120 degree chip, 150 degree visible;  Mode: 3 modes (High, Standard, Flash);  Switch: Press button;  Battery: Li-polymer battery embedded, 3.7V,800mAH;  Charging: USB charge (Android type port), 5V 1A max;  Indication: Red light when charging, auto turns off when fully charged;  Ingress protection:  Rain water proof. Do not use in water;  Applicable: Fits 22-32mm tube;    Packing Included:  1 X Tail light (with Silicone strap);  1 X USB line