Double bracket design, sitting bow installation + seat bar installation, different installation methods are up to you The exterior design of the lamp is made of aluminum alloy, which is durable, strong, and fashionable Effectively keep the light transparent, brighter, softer and less dazzling Tool free and convenient installation: there is no need for tools for sitting bow or seat bar, and one button installation is convenient and fast Colorful : it is composed of seven kinds of color lights, which can bring you more cool light and shadow experience Five modes: a of flashing modes, let you become a different landscape on the road of night riding Real time power display: the four indicator lights in the middle display the power in real time, which makes it easier to charge in time Waterproof design, not afraid of the impact of bad weather such as on the lights (Note: not easy to soak in water for a long time) USB fast charging with built-in 300mAh lithium polymer battery Colour:Black Material:Aluminum alloy Size:3x3.4x3.4cm Package Contents: 1* taillight 2* fixed 1* sitting post bracket 1* sitting bow bracket 1* USB data cable Only the above package content, other products are not included. Note: Light 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.