Length – 3.03 in. (7.7 cm)_x000D_ Width – 1.18 in. (3.00 cm)_x000D_ Height – 1.51 in. (3.84 cm)_x000D_ ?Includes 6 interchangeable keys to fit a wide variety of weapons_x000D_ ?Rail clamp designed to rapidly attach/detach from side of weapon. One handed snap-on and tighten interface keeps hands away from muzzle when attaching/detaching_x000D_ ?Ambidextrous momentary/steady On-Off switch_x000D_ ?Body constructed of impact resistant Engineering polymer_x000D_ ?Face cap constructed of 6063 aluminum with anodized finish_x000D_ ?PMMA lens_x000D_ ?5 gear drive, memory circuit_x000D_ ?Powered by one 3V CR2 lithium battery