The VibraSonic plate has a maximum amplitude of 3/8 inch and runs exclusively in a sine wave pattern. Remember that the VibraSonic is sound actuated so it functions in a true sine wave, which means it is actually slightly decelerating before it changes direction. With the curve at the bottom and top of the sine wave, the transitions are smooth and easy on the body. Mechanical and non-sonic machines are a saw tooth or square wave creating a very harsh, jarring, and cellular stress factor due to the change in the direction of the motor.