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Optical Magnification 1x Field of view 40° Objective F number F1.17 Objective focal length 27.5 mm Focus range 0.25 m - infinity Exit pupil 21 mm Eye relief 25 mm Dioptre adjustment range +5 to - 6 Variable gain V Mechanical Battery 1AA or 1 CR123 Battery life Over 40 h without IR, over 20 h with IR Low battery indicator V IR ON indicator V Auto shut off V Dimensions 118x48x69 mm Weight 300g Environmental Waterproof 20 m for 30 min Operating temperature -50°C...+55°C Storage temperature -50°C...+70°C Configurations Model NVS 14-3 XT Generation 3 IIT Model N3XT3631IC IIT resolution, min 57 Ip/mm