Electric Muscle Stimulation used for Belly, Buttocks Thighs, Arms, Legs. Gives you strong confidence. Body Contouring and Muscle Toning. An EMS (Electrical Muscle Stimulation) slimming machine is a device designed to aid in body contouring and muscle toning through electrical impulses. Use low-frequency electrical currents to stimulate muscles, causing them to contract and relax, mimicking the effects of exercise. This stimulation can help in strengthening and toning muscles, potentially contributing to a more sculpted appearance.