SureFire M Series Scout Light, LED WeaponLights with TIR Lens and Tumbscrew MountHigh performance, recoil proof LED generates 250 lumen white light and 100mW IR LEDs regulated to maximize light output and runtime Total Internal Reflection (TIR) lens creates focused beam with significant reach and enough surround light to accommodate peripheral vision for situational awareness Powered by either two AA lithium batteries (included) for maximum output runtime or by two more readily available AA alkaline batteries Construction: Mil