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wireless transmitter & receiver with audible warning

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I have to help out my daughter do a small project in school and entails
the following:
she has to have a wireless transmitter and receiver and when separated
one from each other say 2 or 3 metres and audible sound is emitted, by any one of them, when a certain distance apart is reached.
could anybody please be of help to maybe design a small circuit or draw one for me as to how i can perform this project? and what components to use?

Thanks to all
Oh thats a good one and easy to do, try to research on EMF emmision, it can be of help.


The original post is 5 years old. I think the OP's daughter has graduated by now, and might even have little kids of her own. :D
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