The original product resembles a regular dumbbell, is 2.5 pound in weight with a spring on either end. According to the official website, this device works with a method called Dynamic Inertia. The claim that the official website makes is that by just shaking this weight for 6 minutes a day is enough to help you get lean and toned arms. You just hold it in various positions and shake it. This back and forth shake is supposed to work your muscles. The claim is that this movement is much better than traditional weight training. I don't believe just 6 minutes will work, but the fact that it uses dynamic inertia is correct, and it works. Shaking a dumbbell is a lot different than the shakeweight.