Amstrad CT-1 Radio/Alarm-Clock
The device isn't interfacing with the computer, ie. the CPC cannot receive or control the clock/radio signals.
The thick black wire is 220-240V supply. The white wire is antennae.
The other two black wires might be speaker... probably, the speaker & wires should be inside of the CT1, but maybe somebody has modified it, moved them outside, and cut the connections...?)
- MP-3 and CT-1 Manual (pdf) (english, french, spanish, german, vlaams)
- 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)