CT-1 Clock/Radio module to sit atop the [[MP-3]] TV tuner, and underneath the [[CTM640/CTM644]] monitor.
The device doesnisn't seem to be interfacing with the computer, ie. the CPC cannot receive or control the clock/radio signals.
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The thick black wire is 220-240V supply. The white wire is probably antennae. The other two black wires are unknownmight be speaker... probably, maybe external the speaker& wires should be inside of the CT1, in case but maybe somebody has modified it doesn't have an internal speaker, moved them outside, and cut the connections...?)
== Service Manual ==
* [http://www.cpcwiki.eu/manuals/Amendment%20Service%20Manual.rar Amstrad CPC464-6128-GT65-CTM644-MP3-CT1 Amendment Service Manual] (pdf) (the '''CT1 parts list, schematic, component map ''' are found on the last some pages)