Is the countour belt an eletronic pulse stimulator? I've had electronic pulse stimulators used on my knees in physical therapy before and they do have a medical purpose but from what I've read, they really have minor effects if the purpose is to build muscle/burn fat.
I couldn't find past articles I've read but here is one that covers some of the various aspects including the fact that the FDA has warned companies selling these devices in the past of making false claims.
http://healthpsych.psy.vanderbilt.edu/AbSonic.htm
This technology has been used for the past 30-40 years in various medical uses and there have been many many products in the past which have been marketed toward the consumer but none have survived as they are not effective for the consumer use.