The beauty of the Piezo element is that it also works in reverse. When a sinusoidal signal (audio) is applied, the conductors are pushed and pulled very quickly, creating sound waves. This in turn bends the metal conductor layers. When a voltage is applied across the crystal layer, the crystals pull on one side and push on the other. Piezo elements are made from two conductors separated by a layer of piezo crystals. Also note that you do not need a fully functional buzzer device, just the piezo element. In other words, they are pretty cheap so go for a good one. Sometimes the Piezo Buzzer packages don't have that much information on them, but you want to find things as close as possible to the information listed above in the Materials and Equipment section. You can find these for just a couple dollars at your local parts store (Radio Shack).
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