The TLR-1 HL now provides an 800 lumen blast of light for maximum illumination while clearing a room or searching an alley. Its wide beam pattern lights up large areas so you can identify who or what is nearby. C4 LED delivers 800 lumens; 15,000 candela; 245m beam; runs 1.75 hours. Solid-state current regulation for consistent illumination level. User programmable strobe can be enabled/disabled. Securely fits a broad range of weapons. Includes keys for Glock-style, Picatinny, Beretta 90two, S&W 99 and S&W TSW. Mounts directly to handguns with Glock-style rails and to all MIL-STD-1913 (Picatinny) rails. Tethered battery door and latch mechanism prevents battery door loss while providing easy battery replacement. Operating temperature: -40°F to +120°F. IPX7 waterproof to 1 meter for 30 minutes.