h a l f b a k e r y
"Put it on a plate, son. You'll enjoy it more."
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Quite simply, its a radio transceiver with a solar panel, or a hand crank, with a directional antenna.
Install this device on multiple playgrounds and direct it to communicate with each other.
Now you have a network of kids talking together on playgrounds.
If you are feeling adventurous, you
can even add a radio FM station kit, so kids can run their own 'local' radio station.
||This could be useful as a time-measuring device for very short intervals - such as the interval between its installation, and it being stolen, smashed, or both.