My experience tells me that in the days of land lines that kinda phone stuff tended to accumulate especially if you liked to tinker. The pickup with the suction cup would stick to the handset of a phone and output the audio, I think they were magnetically coupled to the speaker.
My experience tells me that in the days of land lines that kinda phone stuff tended to accumulate especially if you liked to tinker. The pickup with the suction cup would stick to the handset of a phone and output the audio, I think they were magnetically coupled to the speaker.