This is the hand massager that applies air compression massage to both the top and bottom of the hand. Similar to hand reflexology, it compresses trigger points on the palm and back of hand using a mechanical air pressure system that kneads the hand for a comfortable, spa-like massage. A team of physical therapists found the massager to have potential to help relieve pain and discomfort in the hands; its soothing rhythm helps to relieve the tension, stress, and fatigue associated with extended keyboard and mouse usage. After a hand is inserted into the device’s soft polyester interior, a push of a button begins a 5-, 10-, or 15-minute session at one of four pressure levels. It can also provide far infrared heat during sessions to promote better circulation. Includes four AA batteries. 10 1/4" L x 7 3/4" W x 9 3/4" D. (2 3/4 lbs.)