OK new idea for senior project

Found out that there was a patent on the radio transmitter. My new idea is to create a simple keychain that has three buttons and each button displays a different message related to cpr ( one is for directions when someone is having a heart-attack, one is for choking, and one is the beat for a heart). I need a kit for this has the three buttons and is recordable. Thanks in advance for any help.

The waveshield might be what your looking for...

I'm looking for something little more simple and in keychain form.
Something like this but three seperate playback buttons: http://www.amazon.com/Little-Reminder-Lil-Deluxe-Set/dp/B000N99CGQ/ref=pd_sbs_hpc_3