Streamlight ProTac Rail Mount 2 Weapon Light with Switch - The ProTac series expands into weapon-mounted lights with this 625 lumen light featuring a dedicated fixed-mount for Picatinny rails. It uses either a remote switch with momentary/constant on operation or a standard push-button tail switch, and can run on either a lithium battery or an easy-to-find alkaline battery. Durable, anodized aluminum construction with impact-resistant tempered glass lens IPX4 rated with the Remote Pressure Switch installed