The Argus BNVD-1431 MK2 device is a feature-rich goggle that has a low-battery indicator, built-in auto-off if inactive, and an on-board IR illuminator. The housing accepts a single AA battery providing 16+ hours of use and will also accept any 4-pin Fischer battery pack. Each housing has been vacuum- and positive-pressure-tested on our digital nitrogen purging rig to be waterproof and rigorously tested to ensure reliability.  The devices are assembled in-house with your choice of intensifiers, upgraded screw kits, and finally nitrogen-purged on our digital vacuum/purge rig, and will come with a certified Hoffman report guaranteeing performance. System will come with 1 year warranty. Lens OptionsHere at Cold Harbour Supply, we are happy to offer some of the widest ranges of lenses available to our customers based on their specific operational needs. PVS-14 Standard Lens Set Eyepiece made by Salvo Engineering USA (Torrent Photonics) Objective made in Singapore; OEM'd by Steele Industries Excellent light transmission, flare suppression and resolution Slightly reduced contrast (~5%) compared to Noctis Great budget option Noctis (Formerly Carson) Milspec Lens Set US Milspec lens meeting MIL-PRF-A3256342A tests Excellent light transmission, leading flare suppression and resolution rendering Flat low distortion image Diopter markings for easy diopter settings Photonis Defense Boomslang 50° Wide FOV 25% increase of FOV 10% increase in light transmission over milspec lenses Above  MILSPEC IP68/MILSTD 810 immersion tested Lighter than milspec optics NVD-N Eyepiece + RPO 3.0 Objective Combo  All of the benefits of the legacy RPO 3.0 lens system but with a widened eyepiece with eye relief and eyebox similar to Noctis Milspec lenses Paired with RPO 3.0 objective as recommended by RPO, with superior light transmission, excellent centre resolution  Ultralight - Up to 30% weight savings on any NVG Specifications Material Polymer Tube Type 18mm MX11769 style manual gain Figure of Merit (FOM) SNR x LP/mm Photonis Echo (1800-2200)Photonis Echo+ (2200+)Photonis 4GHG (1800-2200+) Weight 620g with standard optics and a battery Power Supply AA onboard with optional battery pack Runtime 20+ hours Lenses US Milspec or PVS-14 Standard Field of View 40º Diopter Adjustable +2 to -6 Submersion and Dust Rating Up to 2 metres for 30 Minutes Mount Style Onboard Dovetail Onboard IR Illuminator Yes Includes: Argus 1431mk2 NVG Cold Harbour Supply Pro Case or Bag (depending on availability)  CHS 1 Year Warranty On Housing And Assembly Popular Addons: For head-mounting options, check out the Tracer Tactical Head Harness, 4D SOF Cap, or the PGD ballistic helmet.  For lens protection, check out our Ultra Low Profile lens protector, Standard Defender, or CHADs.