The ProTac Rail Mount HL-X Laser is a 1,000 lumen long gun light with an integrated red laser. It features multi-fuel innovation that allows it to accept Streamlight's SL-B26 protected Li-Ion USB rechargeable battery pack or CR123A lithium batteries, ensuring that you'll always have light when you need it. It also incorporates the versatility to use two lithium battery types; two CR123A batteries, or one Streamlight SL-B26 protected Li-Ion USB rechargeable battery pack. The light provides 1 hour 15 minutes of continuous run time on high and over 20 hours on low intensity. Rail clamp designed to rapidly and securely attach/detach from any weapon with a MIL Standard 1913 Rail.