The 403 is a 4-place panel mount, voice-activated mono intercom. This easy to use intercom is designed to fit almost anywhere in the panel. Flightcom 403MC intercom includes: 403MC Intercom Connector kit 4 place mono jack kit Features: 3-position transmit capability Selectable muting and pilot isolate Auxiliary input for music or alerts Rectangular faceplate can be mounted horizontally or vertically Specifications: Weight: 3.6 oz Length: 2.62 in Width: 2.37 in Height: 1 in Not TSO'D Power requirement: 12-28 VDC