Designed to fit a variety of full-size and compact railed handguns, the TLR-8 X accepts either a CR123A lithium battery or Streamlight's SL-B9 USB rechargeable protected lithium-ion battery pack. Interchangeable rear paddle switches accommodate your shooting style. FeaturesMulti-fuel: Uses (1) CR123A lithium battery (included) or (1) Streamlight SL-B9 protected Li-Ion USB-C rechargeable battery pack500 lumens; 5,000 candela; 141m beam; runs 1.5 hours (CR123A), runs 1 hour (SL-B9)Laser mode runs 60 hours (CR123A); runs 36 hours (SL-B9)Ambidextrous rear paddle switches with HIGH and LOW optionsSafe-off feature prevents accidental activation; saves batteriesRail grip clamp securely attaches/detaches without putting your hands in front of the muzzleDurable, anodized machined aluminum constructionUser-enabled strobe functionLength: 2.58 in (6.55 cm)Weight w/ CR123A: 2.64 oz (74.8 g); Weight w/ SL-B9: 2.74 oz (77.7 g)IPX4 water-resistant