All Prices are in US Dollars, GST and Customs Duty may be applicable to your purchase on top of the advertised price. Quick Overview: Clip On Night Vision System 1080P FHD Sony STARVIS CMOS Sensor 0.4-Inch Panel, 3.69 Million Dots, 60 fps Refresh Rate Daytime color mode, Night vision mode Long Eye Relief (up to 70 mm) Built-in FHD video recording, slow motion mode available Powerful Built-in IR Illuminator 328 Yards Clear Nighttime Viewing Range Durable, Waterproof Housing, High Shock Resistance Diopter Adjustable, Focus Adjustable Samsung Original 18650 Battery 2 Years Warranty This unit fits scope with parallax adjustment. Fixed parallax scope can only work with NV100 in specific distances (100yds for example) at specific magnifications. The 12mm has a 12mm lens and lower base mag of 1x (up to 6x), so you will have a wider field-of-view on your display. The 16mm version has a magnification range of 4-24x and a smaller field-of-view, this makes it suited to long-range night-time shooting.