The Holographic Hybrid Sight I (HHS I) features an EXPS3-4 with a G33.STS magnifier. It has great utility for any shooter, whose target ranges vary from close to mid-range. The HHS I provides a solution for engaging threats in close-quarter combat situations, then quickly transitions to a 600-meter targeting or surveillance situation. A quick switch-to-side (STS) mount offers simple, fast disengagement of the G33 magnifier.The durable, night-vision-compatible system offers wide-field optical performance with superior light transmission for visibility in extreme low-light conditions. ∗aiming dots may not be distinguishable without magnification∗reticle ring for this sight is 60 MOA with (4) 1 MOA aiming dotsProduct DetailsNight vision compatibleLength/Width/Height: 7.7" x 2.3" x 3.3" (195.6 x 59 x 83.9 mm)Weight: 22.4 oz (635.1 g)Water Resistant:Submersible to 33 ft (10 m) depthMount: MIL-STD-1913 rail1" WeaverBrightness: 30 total brightness settings; 10 are night vision settingsPower Source: One 123 lithium batteryBattery Life: Approx. 600 continuous hours at nominal setting 12 at room temp.