The ATN PS22-2IA is an attachment for the Daytime Riflescope with 1x-6x (2.5x-4x are optimal) magnification that is converting the Scope into a high-quality, very accurate Night Vision Weapon Sight. The ATN PS22-2IA mounts in front of a Daytime Scope. Re-zeroing of the Scope is not required. The ATN PS22-2IA comes standard with 7/8" Weaver Mount. There is also Adapter for ARMS quick release mount. Optional Ring Adapters allows to mount the unit onto the objective of the Daytime Scope (25...62mm diameter). The IR Illuminator can be mounted onto the optional Picatinny Rail. The ATN PS22-2IA Night Vision System utilizes a 2nd+ Gen. or 3rd Gen. Image Intensifier Tube. This ingenious setup allows the shooter to go from day to night in less than 30 seconds without tools, without changes in eye relief and remain zeroed all around the clock. The ATN PS22-2IA is a complex optical-electronic system. The Night Vision Device contains an Image Intensifier Tube assembly with an integrated high-voltage power source and the three volt battery housing. ATN PS22-2IA Features: Easily changes daytime scope to Night Vision Mounts in front of daytime scope, no rezeroing required Multi-coated all glass optics Fast catadiotric front lens system Light weight and rugged Large 21 mm eyepiece/output window Lightweight and rugged Comes with Quick Release Mount Optional 7/8" weaver mount Optional Scope Mounting System attaches the PS22 unit to the objective of the day scope (25...62 mm diameter) Automatic Brightness Control Resistance to severe conditions Limited Two-Year Warranty ATN PS22-2IA Specs: Total Darkness IR System = Yes "SMART" Technology = No IIT Generation = 2+ Resolution = 40-50 lp/mm Magnification = 1x Lens System = F1.44, 80mm Proshield Lens Coating = Yes FOV = 13° Exit Pupil = 21 mm Range of Focus = 10 m to infinity Diopter Adjustment = No Controls = Direct Remote Control = Yes Automatic Brightness Control = Yes Bright Light Cut-off = Yes Infrared Illuminator = Detachable IR450 IR Indicator = Yes Low Battery Indicator = No Power Supply = 1 x 3 V CR123A type battery Battery Life = 60 hrs Reticle System = No Windage & Elewation Adjustment = No Environmental Rating = Waterproof MIL-STD-810 = Yes Operating Temperature = -40 to +50°C Storage Temperature = -50 to +70°C Dimensions = 150 x 80 x 72 mm 5.9" x 3.2" x 2.8" Weight = 0.64 kg / 1.4 lbs Warranty = 2 years ATN PS22-2IA Day Night Weapon Sight