Nitecore Detective SRT5 750 lm Flashlight, Gray Powered by Cree XM-L2 T6 Runs on: 2 x cr123a batteries or 1 x 18650 battery (not included) Max output/runtime: 750 lumens/1.75 hours ; min output/runtime: .1 lumens/450 hours Peak beam intensity: 6000Cd ; beam distance: 169 yards (155 meters) Waterproof in accordance with IPX-8 (two meters submersible)