Holographic Weapon Sights (HWS) offer true, both-eye shooting for a better targeting experience. The EOTECH XPS2 Holographic Weapon Sight uses a state-of-the-art heads-up display window constructed from 3-layer shatterproof laminate glass and protected by a rugged, roll-bar-style hood. Designed and tested to provide reliable performance in the most demanding environments, this sight is waterproof, fogproof, and shockproof. The XPS2 is the shortest holographic sight yet, needing only 3/4 of rail space to mount. The EOTECH XPS2 Holographic Gun Sight is powered by a single CR123 lithium battery (included). 3.75 x 2.4 x 2.4. Weight: 8.8 oz. Offers 2-eye shooting for a better targeting experience Constructed from 3-layer shatterproof laminate glass Protected by a rugged, roll-bar-style hood Waterproof, fogproof, and shockproof Requires only 3/4 of rail space to mount