Old Small FM Wireless Transmitter see details & photo's (Harborne B32)

Hi all, back in the day before cars had CD / MP3 players installed this is an old FM Wireless Transmitter that we used to use in our cars plugged into our portable CD players / MP3 players so you could play music etc. over the car radio ( you have to tune the radio to receive the transmitted signal ). This one has not been used for quite a few years but it was working fine when last used. I have tried a couple of AAA batteries in it and it does light up but I have not tried to tune it, also the case has yellowed over time. Not worth a lot but I thought I would just check if anybody local wanted it before throwing it away. Kind regards Eric