Anti-theft locking devices for protecting radios; car radios; cassette recorders incorporating radios; clock-radios; mounting fittings for radios; portable radios; radios; radios incorporating a cassette tape players and quartz analogue clock; radios incorporating alarm clocks; radios incorporating alarms; radios incorporating apparatus for the playback for audio tapes; radios incorporating clocks; radios incorporating clocks with light emitting diode digital displays; radios incorporating liquid crystal display clocks; radios incorporating quartz analogue clocks; radios with electronic data decoders; radios with light generating means; radios with sound generating means; tape recorders incorporating radios; vehicle radios