The Streamlight TLR-VIR II w Rail Locating Keys Black includes rail locating keys and CR123A lithium battery. It is a low-profile, weapon mounted tactical light with integrated IR LED illuminator/laser and visible white LED illuminator. The user transitions from white light to IR without having to remove eyes from the target or alter their controlled firing grip. This weapon light securely fits M17 and M18 pistols and all long guns with MIL-STD-1913 rails. IR requires night vision goggles.