1.High brightness LED lights. 2.Use rechargeable lithium polymer battery, which will automatically power off when fully . 3.Sealed and waterproof. 4.The ultra-wide-angle irradiation range provides more safety protection. 5.Two fixing methods: paste installation-can be fixed on objects, strap installation-firmly installed on shapes of car bodies. Product title:Bicycle tail light 7-color drone night warning light 7-color LED USB charging waterproof Light color:white, blue, red, yellow, green, purple, ice blue Light mode:4 modes, fast flashing - SOS flashing - always bright - seven-color gradient flashing Light levels:22 light levels, three levels for each color Button style:push switch, long press to turn on, long press to turn off, short press to switch gears after turning on. Battery life:slow flash up to 8-10H, always bright up to 1-2H (approximate estimate) :4 Pcs Colour:Black Material:ABS Size:about 30x13x12mm/1.18x0.51x0.47 inch Package Contents: 4 * Bike Light 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.