The Roc Loc 5 LED accessory light provides and easy upgrade to assist cyclists with bein seen by other users on busy roads and streets. The unit is easily recharged with a micro-USB cable, and designed to snap securely into place with the Roc Loc 5 fit system, which is widely available on some of the most popular helmets on the market for road and trail riding.The slim profile of the accessory light does not interfere with the fit system's adjustment or function, and the light weight of the system doesn't add unwanted bulk. It's just a fast, easy way to add a bold, bright LED light when you need it.