Model 558 perfect for anyone that doesn’t like to sacrifice. The 558 is compatible with all Generation I-III night vision devices and features an adjustable, locking quick detach mount that offers instant removal and attachment that will hold zero to 1MOA. The operational buttons are located on the side of the sight making this optic ideal for use with EOTech switch-to-side magnifiers. The drop-in replacement Laser Battery Caps (LBC and LBC2) are designed to work with this model as well, increasing your aiming capabilities and speed to target all day and night long. Description: Length: 5.6 inches (142.3 millimeter) Width: 2.2 inches (55.9 millimeter). Height: 2.9 inches (73.7 millimeter). Weight: 13.8 ounces (391.2 grams). Mount: 1 inch Weaver or Mil-Std 1913 rail. Power Source: AA (Alkaline or Lithium). Brightness: 30 settings (10 for NV). Water Resistance: 33 feet (10 meter).