XPS3-2 Holographic Red dot Sight 556 QD Rail Mounts for Airsoft

Optics:Transmission holography – parallax free
Magnification:    1x
Eye Relief: Unlimited
Length/Width/Height:    3.5″ x 2.4″x 2.4″
Weight:226 grams)
Battery Type:    CR123
Waterproof:    Submersible to 10 ft depth
Sealing:Fogproof internal optics
Adjustment (per click):    1/2 MOA
Adjustment Range:+/- 40 MOA travel
Mount: 1″ Weaver or Picatinny (MIL-STD-1913) rail，for 21.2mm