How Does The ChestDefy EMS Microcurrent Massager Works? Using ChestDefy EMS Microcurrent Massager replicates natural muscle contraction by sending impulses from the pads to the targeted muscle group causing them to improve in just weeks of use. This ChestDefy EMS Microcurrent Massager will stimulate your body skin by low frequency to tighten and strengthen your muscles, giving you a satisfactory body figure. EMS (Electrical Muscle Stimulation) through current stimulation, directly sends the signal to muscles, and promotes muscle movement. All you have to do is to fit the abdominal toner to your body and let it exercise your muscles. Your muscle first burns through stored glycogen for energy. EMS ChestDefy Reduction Microcurrent Massager uses a pulse technology that is scientifically proven to tighten & restore muscle tone that greatly helps to achieve a slimmer figure.