I'm helping to build a little model for my son's science project. We want to be able to press a button on a control panel and have a signal sent wirelessly to a small object. The receiver should be as small as possible, about the size of a watch battery or smaller, because it has to fit inside a styrofoam model of a planet. Once this receives this signal, we want the receiver to make a loud beeping noise.
So basically I need some kind of technology that can send radio (or radio-esque) signals to a very small receiver, and have that receiver or something attached to it make a loud beeping noise. The higher the range of this signal, the better.
Any tips to get me started on this project? I'm an electronics novice and this project is a long-term one (his science fair is next year) so I'm perfectly willing to do research on all this if you can point me in the right direction.
R Gould