It’s not the radio that didn’t work. These were fm transmitter/receivers you used to play mp3 players/cd players back in the day when vehicles didn’t use aux cables. It sent the signal over short range fm signal to your radio.
The alternative was the cassette adapter, but some vehicles had swapped to cd
Yeah those worked way better than the fm transmitters. Only problem was my car introduced a humming sound into the signal that got worse with speed lol.