Energy-efficient LED casts even white beam throughout field of vision. Push button switch controls three illumination modes (high, low, and flashing). Light head tilts to direct light where needed. Adjustable, comfortable 24 inch headband holds the light in place. Durable LED lasts 100,000 hours - replacement necessary. LED casts 75 lumens of light on high and 20 lumens on low and throws beam up to 50 meters. 2 AAA batteries provide 40 hours of use on low and 6 hours of use on high. Lightweight LED headlamp weighs only 2.2 oz with batteries.