The EOTech 512 Holographic Weapon Sight is ideal for tactical shooters who need both speed and versatility for close-quarter battle.The rugged aluminum housing assures that the device remains usable in even the roughest of conditions. Reticle: -0: 68 MOA Ring with 1 MOA Dot Dimensions: 5.6?L x 2.0?W x 2.5?H (143 x 51 x 64mm) Weight: 11.1 oz / 312 g Water Resistant: Submersible to 10 ft./3 m Mount: 1? Weaver or MIL-STD-1913 rail Brightness: 20 settings Power Source: AA (Alkaline or Lithium) Battery Life: Approximately 1,000 continuous hours (Lithium) or 600 hours (Alkaline) at nominal setting 12 at room temperature