Optics: Transmission holography - parallax free Magnification: 1x Eye Relief: Unlimited Length/Width/Height: 5.4"x2"x2.25" (137x50.8x57 mm) Weight: 10.9 oz (309 grams) Temperature: -40 to 150 F (using AA lithiums); -20 to 140 F (all other battery choices) Waterproof: Submersible to 10 ft depth Sealing: Fogproof internal optics Adjustment (per click): 0.5 MOA (1/2" at 100 yds) Adjustment Range: +/- 40 MOA travel Mount: 1" Picatinny (MIL-STD-1913) or Weaver rail Return to Zero: Repeatable to 1 MOA after re-mounting