The TLR-7 X multi-fuel rail-mounted light accepts either Streamlight’s SL-B9(TM) USB rechargable protected lithium-ion battery pack or a CR123A lithium battery. Interchangeable rear paddle switches accommodate your shooting style. Ultra lightweight and compact. High power LED for extreme brightness at 500 lumens. One handed snap-on and tighten interface keeps hands away from muzzle when attaching or detaching. Securely fits a broad range of weapons using key kit provided. Operating temperature: -40°F to +120°F. Width: 1.18 in. Length: 2.58 in. Height: 1.27 in. Weight: 2.48 oz. 6000 Series machined aircraft aluminum with black anodized finish.