420 stainless steel head. Plastic body. Waterproof. Bright 3W LED. LED bulb life is approximately 100,000 hours of use. Diving depth of 50 meters. Provides up to 120 hours of continuous light. Maximum output power of 2.6 watts. Maximum luminous flux of 120 lumens. Runs on 4 AA (double A) batteries, batteries included. Flashlight has a length of 6.5". Diameter of flashlight is 1.65". Adjustable wrist strap at end of flashlight. The diving flashlight is an all weather flashlight that will provide light up to 50 meters under waters.