Features Constant Current Drive Technology that maintains consistent brightness for optimal visibility. To turn the light on and off, it requires a one second press-and-hold Dual beam lenses provide light visible up to 800 meters Dual removable silicone strap for bars 22 - 27mm and 27 - 35mm Helmet mount and USB extension cord included Intergrated USB, low battery indicator Output: 200 Lumens max Waterproof construction Modes: (Low-beam) Steady 2 hours / Flash 6 hours; (High-beam) Steady 1 hour / Flash 4 hours| Item Specifications Battery Size N/A Bulb LED Run Time 6 Hours Battery USB Rechargeable