Split design for mian light and turn signal lights,meets your different demands. No tools required.The lights can be easily mounted on on the front/rear of most bicycles.Just hook the light on the front fork and seat pipe with rubber rings. Specification: Battery: 500mAh(for main light) ; 300mAh(for each turning light) ; CR2032 button cell(for remoto controller) Working time: . 16-18hrs(for main light) ; 5-7hrs(for each turning light) Chagring time: . 1 - 2 (main light/turning light) Waterproof: IPX6 Main light size: 55 x 50 mm / 2.2 x 2.0 in Turning light size: 57 x 50 mm / 2.2 x 2.0 in Color: black+white material: plastic Package Contents: 2 x Bicycle Taillight 2 x Remote Control 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. Multiple switchable lighting modes by pressing the buttons on the remote controller.Provides great during nighttime cycling. Features: IPX6 water resistance,the light can be used in ,snow or thick fog.(NOTE:Please do not soak into water for long time). Wireless remote controller installed on the handlebar to control the right/left turn signals and main light. 500mAh main light and two 300mAh turn signal lights can recharge from any device with a USB port.The remote controller power by CR2032 button cell(included).