This lamp is easy to install and won"t take up much space, bring you safety in dark environment and won"t bother your cycling. Features: Four modes can be switched with one button, making it easy to more→use and simple to operate. USB rechargeable design, with large capacity battery for long working time. Compact size and light weight, cycling without burden. Easy and quick to install and remove, not only it can be a bike light, but also it can be a flashlight. High power light with long range, safer night cycling. With battery indicator function, the button will turn red when the battery is low, for timely recharging. IPX4 waterproof, rainproof in dailylife, don"t worry about sudden drizzle.