Compact, powerful, and rugged, the 2016 edition TK09 Flashlight from Fenix utilizes one Cree XP-L HI LED to achieve a maximum brightness output of 900 lumens. Two additional brightness modes are available, plus a dedicated strobe mode, and a tactical tail switch is used for brightness/mode switching, as well as configuring constant or momentary-on functions. It requires either one 18650 battery or two CR123A batteries for operation, and digitally-regulated output maintains consistent brightness regardless of the power source. The housing is constructed from aluminum alloy and has an abrasion-resistant hard anodized finish. Additionally, it is also IPX8-rated for use in harsh environments and is impact-resistant.