The Gem S4P8 device is aimed at individuals who wish to enhance and tone their glutes. Restore the youthful appearance and firmness to your glutes with a few minutes of passive exercise a day, economically and comfortably from the convenience of your home. It features EMS technology (Electrical Muscle Stimulation), which applies specific form and low voltage electrical pulses directly to the muscles, causing muscle contraction and relaxation just as it happens with regular exercise.