Not a vibrator, the Mini-Pro works with the same patented action (direct drive percussion) as the original Thumper, the professional body massager favored by a majority of chiropractors, massage therapists and professional athletes. While the full size Professional Thumper is ideal for 2 person use (doctor - patient), the new Mini-Pro Thumper is smaller, lighter and designed specifically for self-application. Weighing only 3 lbs, the new Mini-Pro has 3 electronically regulated power settings for use on both thick and thin muscles. Use it on low for the rib cage or on children and elderly, where the full size Thumper may be too overpowering. For those hard-to-reach areas like the shoulders and midback. Use it on high for the thighs and calves, on larger, thicker muscles. It's fully adjustable to the person or body part you wish to thump! You feel thumper massage throughout your body, not just on the skin surface. Two anatomically designed massage spheres pivot up and down a full 1/4" (6.35 mm), adjustable from 20 to 40 times per second producing deep penetrating waves to release tension and knots.