PVS-31C is a high-performance dual-tube type night vision binoculars. Precisely and ruggedly built housing and optics meet or exceed military specifications. PVS-31C can be used as handheld or with head gear, helmet mount assemblies for hands free use. Thanks to dual-tube design, PVS-31C delivers superior depth perception and allows using PVS-31C to operate various machines, boats etc., in addition to basic ground operations. A dual-tube night vision system has proved to be safer and more effective in low-light conditions compared to a “bi-ocular” system, commonly known as “PVS-7”, which is a “one lens-two eyes” type of NVD.