hi Pink, all our radios have been serviced, i.e. transistors, which tend to fail after so many years, are replaced, along with any out-of tolerance resistors and capacitors. They are thorughly cleaned inside and out and left on test for minimum 6 hours.
They are to the original spec. i.e. mono rather than stereo but now have the luxury of a lead to which you can connect an external source via the 3.5mm plug. Usually this would be an iPhone or iPod, or other device which has a 3.5mm socket. This could be another brand of phone, an mp3 player or DAB radio.
I hope this answers your question. Any other info please email me at the address on the website.