Serfas TSL-550 USB Headlight The industry's most technologically advanced safety lights All lights are robs compliant and all testing is done in house More efficient leds & high quality lenses to increase brightness & Clarity Produces over 550 Lumens of pure light Includes: Quick Release Handlebar Mount, easy to adjust Helmet Mount, USB Charging Cable, USB Wall Charging Adapter Interchangeable lenses for standard or wide beam patterns are included User replaceable 3300 mAh Li-Ion battery included; This light is compatible with Serfas' BAT-ADT adapter (sold separately)