This is the handheld massager that uses safe sound waves to deeply penetrate tissue and relax sore muscles. Similar to the ultrasound treatments administered by physical therapists, the massager’s imperceptible sonic vibrations penetrate more than 2" below the skin’s surface to help reach—and relieve—pain and tension at their source. The gentle massage treatment activates the body’s natural healing mechanisms, stimulating circulation and repair to help loosen knots and ease discomfort. Safe for use on the whole body, including the face, the device comes with an extension handle to comfortably treat hard-to-reach areas such as the back. Its two frequency settings include a percussive mode that simulates the energizing touch of Swedish massage. Recommended for up to 20 minutes twice per day. Plugs into AC. 8" L x 2" W x 3" D. (19 oz.)