The NVS-21B night vision system by Steiner is essentially the commercial version of the AN/PVS-21 system. These rugged, battle proven night vision goggles have a low profile design and utilize See-Through technology to allow them to instantly adjust to bright light. The NVS-21B features a large field of view that doesn’t affect depth perception, as well as eliminating the chance of tunnel vision and vertigo often associated with conventional night vision devices. In addition, the sensor integration on the NVS-21B provides the user with enhanced situational awareness. Features of the NVS-21BWaterproof Low-profile design See-Through technology automatically adjusts to bright light 2 IR LED auxiliary illumination source Power supply: AA battery 1.5-3.6V alkaline/lithium Steiner NVS-21 Low Profile Night Vision Goggle 9212