The D-221G /321G binoculars/goggles utilize Generation 2+ and III (respectively) technology that offers true stereo vision with enhanced depth percention. This lightweight system features fully adjustable headgear, built-in IR, Automatic Brightness Control, and Bright Source Protection. This wide exit pupil design eliminates the need for interpupillary adjustment. Redundancy of electronically independent image tubes provides increased reliability in critical situations. With an optional 3x lense kit, the D-121B/321B offer versatility in a dual-tube system.