The G5™ Pro-Power® massager is beneficial to anyone who competes, works out, or is involved in strenuous work. Before an activity, use it to enhance flexibility, increase range-of-motion, and reduce the risk of muscle spasms, strains or contusions. After exertion, rely on the G5 Pro-Power® Massager to accelerate the healing process, to reduce pain and swelling by flushing out lactic acid buildup in the muscles, and to relieve muscle pain caused by work and stress. Excellent for the relief of, repair of, and resistance to repetitive motion disorders. (Carpal Tunnel Syndrome, tendonitis, tenosynovitis, etc.) The head of the G5 Pro-Power® accepts all genuine G5 Brand massage applicators. Unit Advantages: Portable: only 12" long Lightweight: weighs only 3 lbs. Hand-held device with a soft rubber grip Variable speed control: 20 - 50 cycles per second