Crimson Trace Corporation CMR-207G, Rail Master Pro Light/Green Laser, Fits M1913 Rails, Matte Finish, Black 01-7720-1 The Crimson Trace CMR-207G Rail Master Pro offers a powerful 400 Lumen LED white light and green aiming laser in a compact and durable unit. The CMR-207 features an aluminum body with ambidextrous activation points. User programmable modes of operation include: Laser + Light" Laser Only" Light Only. This Rail Master Pro features smart electronics that will power down the unit after 5 minutes" (preventing battery drain if activated during casing or holstering). Laser sight is fully user adjustable for windange and elevation. Powered by a single CR123 Lithium battery.