The Streamlight TLR RM 1 is 500 lumens with a 140 meter beam. It runs for 1.5 hours and runs 3.5 hours on strobe mode. It features an independently operating push-button switch or remote pressure switch. The safe off feature prevents accidental activation and saves batteries. The engineered optic produces a concentrated beam with optimum periphreal illumination. It securely attaches to long guns with MIL Standard 1913 Rails. It is powered by one included CR123A lithium batter and is IPX7 waterproof to 1 meter for up to 30 minutes. This kit also includes a key kit. 500 lumens; 140 m beam; runs 1.5 hours; 3 hours on strobe Safe off feature prevents accidental activation; Saves batteries Engineered optic produces a concentrated beam with optimum peripheral illumination Securely attaches to long guns with MIL Standard 1913 Rails Packaged with a key kit offering everything you need to mount to your long gun Powered by one included CR123A lithium battery IPX7 waterpr