this is what you need to make one of these.
enough tile to at least cover electronics (we used a 6"x6" piece from Home Depot
enough styrofoam as tile that is at least a little thicker than a 9V battery (we got it from A.I. Friedman
twice as much posterboard as styrofoam (you need a oiece for the front and back)
one recording module (you can get them here
!!! once you get all that cut the tile, styrofoam and posterboard to all the same size !!!