0.5 Watt Luxeon Star LED Headlight, LED lasting for over 100,000 hours, over 18 lumens brightness, flawless white beam, polycarbonate housing, DC/DC regulator maintains stable light output for duration of use, two stage switch-low beam/high beam, waterproof, uses 2 x AAA sized batteries (included).   Continuous run time: low beam setting – approximately 25 hours, high beam setting – approximately 7 hours.