Convenient charging. The tail light is directly USB rechargeable. It comes with a charging cable to charge from your computer, mobile power or any device with a USB port.FOUR LIGHT MODES: The bike taillight has a one-touch switch that provides four different lighting modes. Including full brightness, half brightness, fast flash and slow flash (switch back and forth)Easy to install: With the easy-to-use one-touch removal button, you can simply slide the light in and out of the bracket without removing the entire mounting bracket. The silicone mounting strap for the taillight is designed with four openings for a snug fit on most sizes of handlebars and seatposts.RIDE SAFE: The bright LED taillight emits an eye-catching wide-angle beam that can be seen from blocks away, so you don't have to worry about being knocked over and effectively alerting the car behind you to the route of the car ahead