After rigorous testing by the Hammacher Schlemmer Institute, this handheld percussive massager earned The Best rating because it produced the most invigorating massage and allowed panelists to easily pinpoint sore muscles. While panelists criticized competing models for being too vigorous, The Best Percussive Massager was lauded for its perfect massage intensity that was "very comfortable and relaxing." The Best model earned the highest marks for relieving soreness in the shoulders, neck, back, and legs, leading one panelist to say its thumping nodes provided "a smooth massage that quickly loosened tight muscles." The unit's dual heads pulse 3,000 times per minute--700 more pulses than any other model--to ensure quick relief of aches and pains. Scoring highest for ease of use, the unit's 9" ergonomic handle allows users to easily reach the lower back or calves and provides a confident grip. Massage intensity adjusts at the touch of a button. With three sets of nodes that offer soft, medium, or firm massage, and an additional set that provides a heated massage. Plugs into AC. 14 1/4" L x 6" W x 4 1/2" D. (3 lbs.)