Here is a simple 2 station intercom for domestic and office use. It is supplied with two speakers and hook-up wire for room to room communication.
Power Supply: 6-12V DC
Current: 28mA (stand-by)
160 mA max @ 12V DC.
Sound level adjustment via Trimmer Potentiometer
PCB Dimensions: 62.5 mm X 50.5 mm X 20.3 mm (2.46 X 1.99 X 0.8 in.)