It isn't . But the Becker unit is obsolete. Mine died in 2015, put a JVC head in and WISH I'd done it years before.
The Becker two channel head and system is just too "1970's" for me.

The ONLY good thing about it, was that cell phone interface that I used to connect my GMRS/FRS radio to. When someone talked on the radio, the Becker would automatically mute AM/FM/CD audio and play the GMRS audio thru the speakers. My JVC does that, but there is nothing automatic about it.