The Gym Energy Duo electrostimulator is an innovative system of double-impact muscle stimulation. The Gym Energy Duo electrostimulator produces alternate muscle contractions which provide the muscles with continuous positive and negative resistance achieving results faster. You can use it on any muscle group anywhere and anytime! Having the body of your dreams had never been this easy! Tone your muscles, increase your resistance and improve your shape with the effective Gym Energy Duo electrostimulator. Comes with 2 years guarantee.