ATN NVGOPS3143HFW PS31-3HFW BNVD-51 Night Vision Goggles Matte Black 1x 18mm Generation 3 Auto-Gated White Phosphor High FOM 2200+ Resolutionhe PS 31 Binocular Night Vision Device can be outfitted with various levels of high performance US made Gen 3 image intensifier tubes. The PS 31 was designed to increase system resolution, significantly reduce head borne weight, improve system of center of gravity, provide additional operational utility and improve overall operator situational awareness and adding a 51 deg FOV for maximum visibility in the field. These tubes are auto gain capable,