NiteRider MiNewt 250 Lumens Cordless Rechargeable LI-ion LED Headlight Three light levels (High, Medium & Low) plus flash mode and USB & Smart wall charging The 25 Cordless optic design incorporates a reflector and Borofloat lens custom tuned for bike riding. This combination delivers a superior beam pattern when compared to total internal reflectors The new MiNewt 25 Cordless raises the bar of what a one-piece, modular bike light should be Just 1 Rechargeable LI-ion powered battery saves the environment from hundreds of disposable batteries Niterider MiNewt 25 Lumens Cordless Rechargeable LI-ion LED Headlight Run Time : 3 Hours -High / 4 Hours -Med / 6 Hours -Low. 4 Hour Charging. Using USB rechargeable LI-ion power to light up, decrease pollution from mercury and other chemicals