fully operational AN/PVS-7A /C Gen III night vision goggle. Both the built in IR illuminator and the internal IR indicator lights work. On/Off switch with button is fully operational. Battery compartment shows no signs of corrosion. Battery door, O-ring, and hinge are in tact and are fully operational. Focus elements on both eyepieces and objective lens are operational and rotate freely. No chips, scratches, or blemishes in the eyepiece or the objective lens optics. Item has some minor cosmetic flaws, but is in perfect working order. Technical Specifications: Field Of View: 40 Degrees Focus Range: 25 cm to infinity. Diopter Adjustment: +2 to -6. Eye Relief: 25 mm. Power Source: Two AA batteries. Weight (with batteries): 680 gm. Used piece in good condition.