Just do not use it. It is new in the box w/ both push button and tape switch. Batteries too. Built-in weapons mount. Mounted on a rifle for pictures and then back in the box.
It is a quality light that is relatively compact.
From Surefire's web site:An extremely rugged and powerful LED module produces 65 lumens of electronically-regulated light with a total runtime of nearly three hours.
Open to firearm/firearm related trades ( + or - $ OK ).
AR stuff, pistols, sniper gear, optics, 1911 stuff, etc.
EM or IM.