electronic sonic controlled Porsche turbo toy
https://syzito.files.fedi.monster/media_attachments/files/113/962/759/002/263/464/original/0c003cb28eb33ced.jpg
Back in olden times, we used to have remote control cars powered by sonar signals, a weird "clicker" device would make a sound that instructs the toy to turn 45 degrees. An interesting technology that requires no electricity / batteries etc. Lost to the decades.
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