Back in the 80s/90s there were keyrings that would play an alarm if they heard a whistle at a particular frequency. You’re basically playing Marco Polo with your keys.
I assume they lost popularity because the batteries tended to run out at inopportune times. Batteries are better now. Maybe it’s time those things made a comeback.
Back in the 80s/90s there were keyrings that would play an alarm if they heard a whistle at a particular frequency. You’re basically playing Marco Polo with your keys.
I assume they lost popularity because the batteries tended to run out at inopportune times. Batteries are better now. Maybe it’s time those things made a comeback.
I remember those! I think the comeback version is the Tile or AirTag but I’m too old to hear them beep.