Using the Roc Loc 5 LED light is easy. First, make sure your helmet has the current Roc Loc 5 fit system (FS64) by checking the rubber over - molded dial. Then, snap the light securely into place on the fit system. To recharge the light, simply connect it to a power source using the micro - USB cable. When using the light, keep in mind that it's designed for road and trail riding. Avoid using it in extremely wet or harsh conditions as it may damage the light. For maintenance, clean the light with a soft, dry cloth regularly. If you notice any issues with the fit or the charging, refer to the compatibility photo to ensure you have the right version of the fit system.