The Princeton Quad Tac Headlamp Aimed to meet the highly specialized needs of outdoor sportsmen and the US military! Has four output modes - the strongest of which can shine the 4 LED&';s a staggering 37m Easy-to-change lens filter system designed for specific nighttime activities: red for preserving night vision, blue for blood tracking and green for hunter safety. 45 Lumens Output Waterproof to 1 meter for up to 30 minutes 4 Ultrabright LEDs Burn time of up to 105 Hours Includes 3 AAA Batteries Weighs only 101 Grams UL Rating Approved The Quad Tactical augments the original Quad&';s lightweight and durable design with three interchangeable lens covers.