Fix your posture without resorting to the book-stack-walk?

I know that I have terrible posture when I sit at my desk. I tend to stand and walk properly, but I have a jellyfish spine at my desk. However, I hate gimmicky gadgets and I would never ever resort to using this. It's a small pod that you stick to your chest or attach to a bra strap and it vibrates whenever you slouch. I love that they call it a microcomputer! -- complete with exclamation marks! Cause it's so rare to have computer chips is stuff nowadays...!

This is a 3-am infomercial if I ever saw one. How many of these things do you think they sell? They won't be getting any of my money!