One of Princeton Tec"s most popular headlamps, the durable EOS is an outdoorsman"s dream come true. With a single long-throw maxbright LED encased in a rugged, molecular bonded, watertight housing, the EOS is up to any challenge that a trail, work site, slope, or stream will throw at you. Four output modes (high, medium, low, and flash) allow the EOS to keep its regulated brightness while the batteries remain at optimum levels. The EOS is also available in the following models: EOS Tactical, EOS II, EOS Industrial, and EOS Bike. Uses AAA batteries (not included).