The Streamlight ProTac Rail Mount 1L-X USB Pro Gun Light combines multi-fuel utility with a compact form factor and serious brightness to create the ultimate weapon light for short-barreled rifles, carbines, SMGs, and more. It operates using the included SL-B9 rechargeable battery pack or one CR123A battery (not included), giving you plenty of power options when you need extended operation. The ProTac 1L-X also features the Jack-Cap tail cap, which provides multiple options for activation: choose push-button activation or remote pressure switch control. The integrated port provides secure attachment for the included remote pressure switch, while the rail-clamp system fits MIL-STD-1913 Picatinny rails. The kit also includes an M-LOK mount. And with an 850-lumen max output, the 1L-X has enough power to overcome the darkness. TEN-TAP programming allows you to select 3 different operating programs: high (850 lumens), low (100 lumens), or strobe. 30 minutes operation on high, 4.5 hours on low. Includes 1L-X USB Pro Light, Jack-Cap tail cap, M-LOK kit, momentary switch, SL-B9 rechargeable battery, hardware kit, and USB cord. Designed for use on rifles, carbines, SBRs, PCCs, and more Maximum 850-lumen output on high Multi-fuel utility: operates on the included SL-B9 rechargeable battery or one CR123A battery Fits standard Picatinny rails or M-LOK slots Jack-Cap tail cap for redundant activation via push-button or remote switch Integrated port for secure attachment of pressure switch TEN-TAP programming for control of high/low/strobe modes