My prototypes were my "cue cards" for my pitch: I simply described (and indicated) each wonderful quality embodied by my products.
My presentation talk (aka Pitch) basically went like this:
"Hi. My name is _______. My invention is (the) _________. I invented this product to help people who have the problem of ____________."
I then did my best Vanna White in describing how my invention would solve the problem, while indicating each part of my product that had a specific application in solving that problem.
(After two of my presentations, a Panel member commented that they really liked my presentation.)