First hand-held, lithium battery-powered programmable flashlight that provides 600 lumens of light with 253 meters of beam distance.Features:Ten-Tap Programming Choice of three user selectable programs:- 1.) High/strobe/low- 2.) High only- 3.) Low/high- C4 LED technology, impervious to shock with a 50,000 hour lifetime- 3 light output levels:- High 16,000 candela peak beam intensity, 600 Lumens, 1.25 hours runtime- Low 800 candela peak beam intensity, 33 Lumens, 18 hours runtime- Strobe - 2.5 hours runtime- Multi-function, push-button tail switch for one-handed operation- Optimized electronics provide regulated intensity- Durable anodized machined aircraft aluminum construction- Anti-roll head prevents the light from rolling away when you set it down- Removable pocket clip- O-ring sealed glass lens- IPX7; waterproof to 1 meter for 30 minutes- 1 meter impact resistance tested- Uses two 3V CR123A lithium batteries (included)- Barrel diameter: 1.0 (2.54 cm)- Length: 5.40 (13.7 cm)- Weight: 5.6 oz. (159g) with batteries