The CMA is a 12-volt microphone amplifier with two microphone inputs that can be connected to Blaupunkt radios.

Coach Audio / Amplifiers
Amplifiers
Output power (RMS) 2 x 20 watts
2 Microphone input jacks
Dimensions: 56 x 137 x 97 mm (wxhxd)
Weight: 0,455 kg
Operating voltage: 12 V