The SureFire M300 Mini Scout Light, powered by one 123A lithium battery, is an ultra-compact and powerful LED WeaponLight that mounts securely to any MIL-STD-1913 Picatinny rail via an integral thumbscrew clamp. The M300’s recoil-proof LED emitter is focused by a TIR lens to create a high-intensity 500-lumen beam with plenty of reach for close- to medium-range applications with enough surround light to optimize situational awareness. Mfg: Surefire SPECS: Max Output: 300 Lumens, Tactical Runtime: 1.3 Hours, Length: 4.1 Inches, Bezel Diameter: 1.25 Inches, Weight w/Batteries: 4.8 oz, Battery: 1, 123A (Included).