> The 518 sight features side button functionality. It's also compatible with the drop-in Laser Battery Caps that EOTech designed to enhance aiming through the use of visible and IR lasers. -0 68 MOA Ring w/ 1 MOA Dot Dimensions: 5.6?L x 2.2?W x 2.9?H (142.3 x 55.9 x 73.7mm) Weight: 13.8 oz / 391.2 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 Battery Life: Approximately 1,000 continuous hours (Lithium) or 600 hours (Alkaline) at nominal setting 12 at room temperature