This EOTech XPS2 Weapon Sight is one of the smallest, shortest and lightweight EOTech holographic weapon sight available without night vision. It operates on a single 123 lithium battery configured to leave more rail space than ever for rear iron sights or magnifiers. Reticle: -2: 68 MOA Ring with 2 1 MOA Dots Dimensions: 3.8?L x 2.1?W x 2.5?H (97 x 54 x 64mm) Weight: 9.0 oz / 255 g Water Resistant: Submersible to 10 ft./3 m Mount: 1? Weaver or MIL-STD-1913 rail Brightness: 20 settings Power Source: 3 Volts, (1) 123 Lithium battery Battery Life: Approximately 600 continuous hours at nominal setting 12 at room temperature