Princeton Tec EOS Tactical Headlamp. One-watt LED operates in high, medium, low and flashing modes to meet your up-close and distance needs. Current regulation ensures constant brightness as long as the batteries have sufficient voltage. In the strongest mode, LED shines an impressive 56m. 45 lumens. 121 hour burn time. Color, interchangeable lens covers. Waterproof to 1m. Includes three AAA batteries.