Streamlight’s ProTac HL-X Dual-Fuel High-lumen Tactical Light delivers tactical performance with versatile power options. Dual fuel capability, uses two CR123A lithium batteries; also accepts one Streamlight rechargeable 18650 lithium ion battery to reduce down time. Multi-function, push-button tactical tail switch. TEN-TAP® programmable to select one of three different programs. Constructed from 6000 series, anodized, machined aircraft aluminum. C4® LED technology delivers extreme brightness. Solid-state current regulation ensures consistent illumination levels. Other features include a gasket-sealed AR-coated glass lens and an anti-roll head.