The Holographic Hybrid Sight I (HHS I) features an EXPS3-4 with aG33.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 dots. Night vision compatible Length/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) depth Mount: MIL-STD-1913 rail 1" Weaver Brightness: 30 total brightness settings; 10 are night vision settings Power Source: One 123 lithium battery Battery Life: Approx. 600 continuous hours at nominal setting 12 at room temp. G33.STS is compatible with all EOTech Holographic Weapon Sights Fixed Magnification: 3X Eye Relief: 2.2 (55.8 mm) Field of View: 7.3° Sealing: Fog resistant internal optics