Lightweight, compact, low profile, the Streamlight 88058 ProTac Rail Mount Tactical Light features the latest in shock-proof power LED technology. The rail clamp is designed to rapidly and securely attach/detach from rifles, carbines, and submachine guns with a MIL Standard 1913 Rail. This 350-lumen light features a dedicated fixed-mount for Picatinny rails. It uses either a remote switch with momentary/constant-on operation or a push-button tail switch. TEN-TAP Programming offers the choice of three operating modes: high/strobe, high only, and low/high. Dual Fuel: The ProTac Rail Mount Tactical Light uses one AA alkaline or one CR123A lithium battery; also accepts AA lithium batteries.