The 4W Slim Audio Interface links any 4-wire analogue intercom system into the Green-GO digital Ethernet network. This audio in/out interface connects either to an existing matrix or other analogue interfacing products. This allows an audio signal to be injected into the Green-GO network and transmitted to any other location on the same Ethernet network. When use as a matrix style intercom system, one channel of the matrix system can be used as a group on the Green-GO systems.