Revolutionary focus control LED illumination allows the user to dial up the light from a focused beam to flood mode. The on/off switch is large enough for use with gloves. The battery pack, worn on the back of the head, has a red light for safety which can be adjusted to flashing, steady on, or turned off. LED provides up to 230 lumens of light on high mode, 115 lumens on medium mode, and 25 lumens on low mode. Runtime is 10 hours on high mode, 20 hours on medium mode, and 160 hours on low mode. Lamp measures 2.8"H X 2.8"W X 1.7"D and weighs only 5 ounces. Unit comes with an elastic head strap and three AAA batteries.