Electric Muscle Stimulation (EMS), also known as neuromuscular electric stimulation (NMES) is the elicitation of muscle contraction using electric impulses. The impulses mimic the action potential coming from the central nervous system, causing the muscles to contract. Using EMS ChestDefy Reduction Microcurrent Massager replicates natural muscle contraction by sending impulses from the pads to the targeted muscle group causing then to improve in just weeks of using. This EMS ChestDefy Reduction 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 send signal to muscles, and promote muscle movement. All you have to do is to fit the abdominal toner to your body and let it exercise your muscles. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.