The INOVA XS features the same exceptional engineering you'd expect from the INOVA line, in an unexpectedly compact, lightweight size. Powered by a single AAA alkaline battery, it has a patented optical system - precision-machined aluminum reflector with thermal interface - that provides superior light projection and visibility. With an effective range of 190 feet, its beam is exceptionally powerful for such a compact flashlight. Dual-mode functionality provides long hours of either High or Low power light output. The included metal S-Biner and lanyard make it a snap to attach the XS to a key chain, belt loop, zipper pull, or D-ring, but it's small enough to fit easily in a pocket, too, and light enough to carry with you wherever you go.