The Equilibrium Therapy Massage Pad is clinically proven to promote relaxation, improve back flexibility and even increase stride length. Each massage session lasts for 30 minutes; it strokes, vibrates and oscillates, stimulating the muscles. There are three different settings: Low - To cool down after exercise. Medium - To warm muscles prior to exercise. High - To help alleviate back problems. The Equilibrium Therapy Massage Pad battery lasts for at least six sessions and recharges in three hours, using the included portable charger.