"The Streamlight TLR RM 1 HL-X USB Tactical Lighting System features a multi-fuel design that can run off the included rechargeable battery pack or 500 lumens using a standard CR123A battery (not included). Independent push-button and pressure switches allow for operation the way you need it, plus the pressure-switch wires are routed in a way that won't interfere with rail space. This Streamlight flashlight mounts to MIL Standard 1913 rails, while the rugged 6000-series machined aircraft aluminum housing with an anodized finish ensures this tactical light stands up to whatever comes its way. The TLR RM 1 produces up to 1,000 lumens using the rechargeable battery or 500 lumens using a coin-cell battery, plus it includes a strobe feature. Built with a high-temperature, shock-mounted and impact-resistant BOROFLOAT glass lens. IPX7 waterproof rating withstands submersion up to 1m for 30 minutes. This Streamlight gun light includes a key kit, mounting hardware, momentary pressure switch, 1 SL-B9 battery pack, and a USB-C cord. Mfrs. limited lifetime warranty. Length: 3.64"". Weight: 3.12 oz. (With SL-B9 battery pack); 3.02 oz. (With CR123A battery). Produces up to 1,000 lumens and includes a strobe mode Multi-fuel design runs on rechargeable or CR123A battery Independent push-button and pressure-switch operation Wires are routed to allow maximum rail space Mounts to MIL Standard 1913 rails Rugged anodized aircraft aluminum IPX7 waterproof design BOROFLOAT glass lens"