Surefire M640 6-Volt Dual Fuel Scout Light® Pro w/ Z68 Tailcap 1500 LumensThe Dual Fuel Scout Light Pro brings together the proven features of the M600DF Scout Light, with SureFire's new Low Profile Mount providing unprecedented flexibility to position the light on the rail. The LPM is tough and secure, attaching easily to any MIL STD 1913 or M LOK rail. The Dual Fuel Scout Light Pro's ultra high output LED is recoil proof and generates either 1,200 lumens with 123A batteries or 1,500 lumens with the rechargeable SF18650B