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Can you make a wallet transmitter or something similar to work with a spy earpiece?

I was looking at this product http://www.tayx.co.uk/wireless-earpiece/invisible-earpiece.html and thought I could make my own transmitter for it instead of buying there inductive wallet transmitter http://www.tayx.co.uk/wireless-earpiece/walkie-talkie-earpiece-kit.html Since I already have a walkie-talkie that I can program in unique frequencies I just need to build the wallet transmitter. Anyone know about this?