Bookman Curve Rechargeable high power headlight with a brightness of up 220 lumen and a run-time of up to 70 hours. It easily attaches to the handlebar with the elastic silicone band. On the brightest steady light setting, the light produces 220 lumen for one hour. In the power saving and flashing modes the light can last up to lengthy 70 hours. The design of the lens ensures a wide range of light to the front and sides providing 180 degrees of visibility. The completely weather resistant light (IP-44) will show you the way through rain, hail or snow. Fits handlebar diameters from 22 to 42 mm.