Electronic Trimmer Has Any One Had Experiance Any With Ab Trimmer Belts, What Are The Effects?

Has any one had experiance any with ab trimmer belts, what are the effects? - electronic trimmer

So my friends and I are about to punish these electronic receiving his car with electric shocks, to look good, but it really works, and can thighed etc. and are used in your arms? Is there a possibility that can end up with a really strange body which means that the tone in one place, weak in another? Can you give me some advice or do's and don'ts? Thank you!