These tubes are auto-gain-capable, allowing the system to adjust the brightness of their image as situations on the ground dictate.
The ability to pivot the tube housings against the helmet surface creates an overall lower profile, increasing operator safety and equipment life. Operators' input, the PS-31 was designed to increase system resolution, significantly reduce head-borne weight, improve the system of the center of gravity, provide additional operational utility, improve overall operator situational awareness, and add a 50 deg FOV for maximum visibility in the field. In a sea of dual-tube night vision goggles, the PS-31 is one of the smallest and lightest units by far. The PS-31 Binocular Night Vision Device (BNVD) is a compact, lightweight, dual-tube goggle to replace the legacy PS-15.