The M20 range of school intercoms is a cost effective basic intercom, where only one Master Station and up to a maximum of 60 class room Sub Stations are required.

The range includes a 6-way M630, 12-way M1230, 20-way M20x20, 40-way M20x40 and 60-way M20x60. The system consists of the Master Station with all the selection switches. A power supply box which also contains the main audio/control PCB which is connected to the master via a 3 meter cable. A Termination Box with plug in terminals for all the connections to the Sub Station, it is also connected to the master via a 3 meter cable.

The system requires a 220/240vac power point. A battery backup is available for the system. The M630 and M1230 do not have a Termination Box, the connection to the Sub Station can be made with connector blocks.