The NVD-BNVD-SG Binocular is a dual tube goggle with gain control. The BNVD-SG operates with a single control knob that controls both eyepieces simultaneously. Depending upon the amount of ambient light, the user can adjust the tube brightness (gain) lower to compensate for overly bright conditions or to increase the gain under extreme dark conditions. The BNVD-SG can be used as a monocular by choosing which side you want to use as your night vision eye and rotating the other side/arm of the binocular up and out of the way. This enhanced capability allows the user to rotate either monocular channel away from their eye while leaving the other monocular channel in place. This provides the operational flexibility to use the BNVD-SG as either a dual-eye or single-eye device. When used as a monocular, the user can operate the BNVD-SG with weapon-mounted sighting equipment without sacrificing night-time situational awareness. Best of all with all the added features, the BNVD-SG is still substantially lighter than the AN/PVS-7 single-tube goggle!