Ultrasonic Tens uses a device to send a low-voltage electric current to the skin over the area where you have pain. This offers relief by blocking the pain messages that go to your brain. This acts as a method of pain relief involving the use of a mild electrical current. Ultrasonic Tens is a small, battery-operated device that has leads connected to sticky pads called electrodes. When you have finished using the machine for the day, carefully remove the pads from the skin and clean the skin with ordinary soap and water. this is very effective and economical both.