The 403 is a 6-place panel mount, voice-activated stereo intercom with instant music muting and pilot isolate. Easy to use and designed to fit almost anywhere in the panel. • 3-position transmit capability • Rectangular faceplate can be mounted horizontally or vertically • Alternate faceplate for 2.25" instrument panel mount • 5" long x 2.4" wide x 1.2" high • Two-year warranty Switches provided in installation kit allow individual headphone positions to select either stereo or mono mode, allowing the use of monaural headsets.