The HWS 558™ is perfect for anyone that doesn’t like to sacrifice. The 558 is compatible with all Gen I-III night vision devices and features an adjustable, locking, quick-detach mount that offers instant removal. Acquiring your target is easier than ever thanks to the innovative technology in the EOTech Model 558 Holographic Weapon Sight. Working flawlessly alongside your favorite Gen-I-III night vision device, this Holographic Sight from the experts at EOTech works all day and night long to improve your aiming capabilities and speed to target. A locking, quick detach mount allows for instant removal of your EOTech Model 558 Holographic Firearm Sight from your 1" Weaver or MIL_STD-1913 rail, giving you the ultimate power over your shooting experience. With operational buttons along the side of the sight and up to thirty different settings, the EOTech Model 558 Holographic Gun Sight makes aiming and using your weapon intuitive in all situations.image Specifications for EOTech Model 558 Red Dot Sight: Length/Width/Height: 5.5" x 2.2" x 2.8" (140 x 56 x 71 mm) Weight: 13.3oz (377 g) Waterproof: Submersible to 33 ft. (10 m) depth Mount: 1" Weaver or MIL-STD-1913 rail Return to Zero: Repeatable to within 1 MOA after re-mounting Brightness: 20 daylight settings; 10 additional settings for Gen I through III+ night vision devices Power Source: Two 1.5 V AA batteries - Supports lithium, alkaline, or rechargeable Battery Life: Lithium: 2500 hours AA alkaline: 2200 hours