Optics: Transmission holography - parallax free Magnification: 1x Eye Relief: Unlimited Length-Width-Height: 3.5"x2.4"x2.8" (91.4X 60.9x71mm) Weight: 11.2 oz (317grams) Temperature: -40 to 150 F, Waterproof: Submersible to 10 ft Night Vision Brightness Range: 1280:1 with NV switch engaged