The 558 is compatible with gen 1-3 night vision devices and features an adjustable locking qd mount for instant removal.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 aiming capabilities and speed to target all day and night long.Battery: AA 1.5VMagnification: 1xObjective: 30x23mmField Of View: 30 yds @ 4" Eye ReliefEye Relief: UnlimitedDot Size: 1 MOALength: 5.60"Weight: 13.80 ozFinish: BlackReticle: 68 MOA Ring/Red DotAdjustment Size: .5" @ 100 ydsProofs: Water Resistant/FogproofOptic Coating: Anti-ReflectionWindage Elevation: 40 MOA