The ProTac Rail Mount HL-X is a 1,000 lumen weapon-mounted 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 runs on either two CR123A lithium batteries or one Streamlight rechargeable 18650 battery.Features :Remote pressure switchHigh, low, and strobe settingsAluminum constructionFixed rail grabber with thumbscrewIncluded M-LOK Mount