This product stimulates the nerves by using small electrical impulses. These impulses diminish the transmission of pain signals to the central nervous system which helps the patient to get relaxed. This unit also helps to boost the production of pain relief hormones in our body. Santamedical electronic pulse massagers contains a main control device, 2 sets electrode wires, 4 electrodes, charger, USB cable and user manual. The electrodes are connected with the master unit by cables that deliver the electric pulses. When you apply the electrodes to the skin where you feel the pain and turn on the main unit then its start working by stimulating your nervous and provide relief in chronic pain. You can adjust the level of electric pulses according to your tolerance level.