Streamlight ProTac Rail Mount 1 Weapon Light - The ProTac series expands into weapon-mounted lights with this 350 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; Strobe For Signaling Or Disorienting; Uses One AA Alkaline/Lithium or CR123A Lithium Battery; Integrated Rail Clamp Attaches To MIL-STD-1913 Rails; Easy To Attach, Secure Mounting; Remote Pressure Switch Features Momentary And "Constant On" Operation; TEN-TAP Programming - Choice Of Three User Selectable Programs: 1) High/Strobe 2) High Only 3) Low/High;