Muscle Stimulator uses smart EMS technology which progressively contract and target your muscle for maximum benefit. EMS (Electrical Muscle Stimulation) is a technology that uses electrical signals to directly stimulate and exercise the muscles. Grab yours now and get a stunning beach ready body! Product Features Advanced EMS (Electrical Muscle Stimulation) technology. Builds muscles and relaxes stiff muscles! 15-level intensity and programs. Match different training needs with varying current-transmitting intensity and different massaging and tapping combination! Light and portable. Host patches and gel pads are convenient to carry, allowing you to use the MuscleMax Stimulator anytime, anywhere!