Its lightweight design and one touch adjustment makes the Fuel 4 ideal for varied applications. 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 unique, water-resistant lamp housing tilts easily and remains securely in place, providing convenient, targeted illumination regardless of the situation. Uses three Alkaline AAA batteries (included) . With batteries, the Fuel weighs a mere 2.75 oz.