Abtronix X2

I'm reading this Abtronix x2 reviews right now because a friend is selling one to me. I don't know anything about it except for the fact that it's a gadget used to tone abdominal muscles. But does it really work? Well, that's what I'm very eager to find out. I don't want to waste my money on it. And besides, I need to know if it's safe to use because according to the information I got from the web, the Abtronix works by sending signals to the brain which in turn makes the stomach muscles contract and tighten. But are these signals safe? Will it interfere with my normal brain functions? These are just some of the questions I have right now and hopefully the reviews online will answer all of it.