Designed to put light where you need it, the Knucklehead is the most versatile light youŸ??ll ever own. Engineered optics feature dual parabolic reflectors within a larger textured reflector optimizing light on target in conjunction with an overall smooth flood pattern Shockproof dual C4?? premium LED technology delivers 200 lumens 4 modes: High Ÿ?? 1150 candela peak beam intensity, 200 Lumens, 3.5 hour runtime, Low Ÿ?? 350 candela peak beam intensity, 63 lumens, 16 hour runtime, Moonlight Ÿ?? 20 day runtime, Flash Ÿ?? 8 hour runtime Dual power source: accepts rechargeable NiCd battery pack or 4 "AA" alkaline batteries Rubber dome push-button actuator is easy to operate even when wearing heavy gloves Removable magnet with 135 lb pull strength features a replaceable rubber boot Optimized electronics provide regulated intensity High-impact, super-tough nylon polymer construction for execptional durability 2 meter impact-resistance tested IPX4 rated for water-resistance Serialized for positive identification 9.2 in. (23.4 cm); NiCd 23.1 oz (655 grams); Alkaline 18.3 oz (519 grams) Available in black or yellow Limited lifetime warranty, direct back from Streamlight