Taclight is made from air-craft grade aluminum and can withstand extreme temperatures from freezing to boiling. It is water-proof and shock resistant. Taclight has built-in zoom function and high-powered bulbs are 40x brighter than your regular flashlight. It has 5 modes, high brightness, medium brightness, low brightness, Strobe (intermittent flashing), SOS (emergency signal). Taclight Tactical Flashlight provides you with with up to 100,000 hours of ultra bright light, just add 3 AAA Batteries (sold separately) & you're good to go!