The ProTac Rail Mount HL-X Pro is a long range, low-profile, gun-mounted light that produces 50,000 candela (1,000 lumens) and shines for 447 meters. Its Jack-Cap tail cap switch offers operational switch redundancy with both push-button operation or remote pressure switch operation. TEN-TAP programming allows for selection of three different operating programs: high/strobe, high only, low/high. Choose between USB rechargeable or battery operated (two CR123A lithium batteries).