Big in the mid 80s I think, lots of people had one of these at my school. And it was a good idea too, I can't think why you don't see these for sale today.
The basic idea was that you whistled and the device would bleep back at you.
The basic idea was that you whistled and the device would bleep back at you.


Got through a fair few.

he also had one of these as he is always forgetting his keys. but his whistle wouldn't set it off

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