Streamlined, efficient and affordably priced, the Princeton Tec Fuel 4 is a do-it-all headlamp. Its lightweight design and one touch adjustment makes the Fuel 4 ideal for varied applications, including camping, backpacking, running, bicycling or any other nighttime or low-light activity. On high, the Fuel 4's four Ultrabright LED bulbs cast a beam up to 128 feet in length. Medium and low settings product shorter length beams but deliver improved burn times. With Alkaline batteries, run time on the high setting is 50 hours, while the medium and low settings increase efficiency to 90 and 146 hours, respectively. A flash setting produces strobed lighting for emergency signaling. The large, single switch design makes the Fuel 4 easy to operate. The unique, water-resistant lamp housing tilts easily and remains securely in place, providing convenient, targeted illumination regardless of the situation. The Fuel 4 is powered by three Alkaline AAA batteries (included). With these batteries, the Fuel weighs a mere 2.75 oz.