Perfexa Nerve Stimulator Tens Machine Dealer in chennai Perfexa Nerve Stimulator Tens Machine Dealer in chennai central Perfexa Nerve Stimulator Tens Machine Dealer in tamilnadu A TENS machine is a small, battery-operated device that has leads connected to sticky pads called electrodes. You attach the pads directly to your skin. When the machine is switched on, small electrical impulses are delivered to the affected area of your body, which you feel as a tingling sensation.