Dual removable silicone strap for bars 22-27mm and 27-35mm. Thermal management and Battery protection circuit. Constant current drive technology (maintains consistent brightness through out specified run-time). Dual beam lenses (Wide beam 22Degree- Hi/Low. Narrow beam 15Degree - Hi/Low). Visible up to 800m. 100% waterproof, integrated USB, low battery indicator. Helmet mount and USB extension cord included.