The TLR-7 HL-X sub USB high-lumen, high-candela gun light accepts Streamlights SL-B9 USB rechargeable protected lithium-ion battery pack or a CR123A lithium battery. Interchangeable rear paddle switches accommodate your shooting style. Specifications for Streamlight TLR-7 HL-X 1913 Sub USB Multi-Fuel High-Lumen Rail-Mounted Light: Manufacturer: Streamlight Light Output: 1000 lumens Battery Type: Lithium Ion Color: Black Length: 2.51 in Weight: 2.49 oz Battery Life: 0.5 hours Weather Resistance: Waterproof Finish: Aluminum Battery Quantity: 1 Water Resistance Level: IPX-7 Gun Rail: Picatinny Features of Streamlight TLR-7 HL-X Sub USB Multi-Fuel High-Lumen Rail-Mounted Light Custom TIR optic produces a concentrated beam with optimum peripheral illumination IPX7 waterproof to 1m for 30 minutes Multi-fuel: Uses one SL-B9 battery pack or one CR123A lithium battery Rail grip clamp system securely attaches/detaches quickly and safely with no tools and without putting your hands in front of muzzle. Securely fits a broad range of full-sized and compact guns. "Safe off" feature prevents accidental activation; saves batteries Durable aluminum construction, interchangeable ambidextrous rear paddle switches easy to swap out with multi-tool Package Contents: Streamlight TLR-7 HL-X Sub USB Multi-Fuel High-Lumen Rail-Mounted Light 1 SL-B9 USB Rechargeable Lithium-Ion Battery Key Kit Interchangeable High and Low Switches