The Surefire M600U SCOUT LIGHT Weaponlight is a 6-volt ultra-high-output LEDw/ M75 Thumbscrew Mount. Use the Scout Light for any threat level; 1,000 lumens of tactical lighting powered by two 123A batteries. With its recoil-proof, ultra-high-output LED delivering 1000 lumens of blinding white light, the M600U ensures you wont. Its proprietary TIR lens shapes the light into a far-reaching beam with ample surround light for exceptional peripheral vision, making the M600U ideal for medium to longer-range applications. Battle proven and rugged, the M600U is also lightweight and maneuverable. It quickly and securely attaches to any MIL-STD-1913 rail via its integral thumbscrew clamp and it is easily activated by either clicking its push-button tailcap switch or by pressing the pressure-activated tape switch on select models.