The MASTER (Control Interface) is equipped with a complete front panel on which there are practical commands and function keys, indicator lights, a multifunction backlit display (for diagnosis and setup) and a stereo headphone jack output; all this makes MCI 330 an easy
and intuitive tool to use. On the rear panel, however, there are two USB ports, an RJ9 connector to which it is possible to connect a series of accessories and a jack output to which a manual button can be connected. Inside MASTER there is a rechargeable battery which, in the event of a blackout, guarantees system autonomy of up to 20 minutes.

MASTER is powered by a small external power supply, or by any power source, between 10 and 15Vdc.