The Tail Light is built in 500mAh rechargeable lithium battery,comes with a charging cable, can be connected to laptop computers, car chargers, mobile phone chargers, mobile power charging. Five light mode options, High-brightness LED lamp beads can meet most of the visual warning needs during riding. Waterproof design, can resist rain and humid climate, can be used normally in rain, suitable for outdoor riding. The tail light an eye-catching wide-angle beam, need not worry about being knocked over by others, can be seen from blocks away. High-quality remote-control LED directional lights are suitable for all kinds of bicycles. The product is small and portable. The installation is very simple. It can be used on a variety of equipment and can also be used as an emergency device. Specification: Material: ABS plastic Size Chart: Size: Controller 5.6x3.7cm/2.20x1.46inch, Light 10x3.5cm/3.94x1.38inch Package Includes: 1 Piece Bike Tail Light 1 Piece Remote Control 1 Piece USB Cable 1 Piece Base bracket 2 Piecs Strap