20PCS Electrode Wire Button Type Short Copper Foil Wire Electrode Lead Wire Adapter for TENS.Feature: 1. Short Wire: Convenient to carry, easy to operate, does not take up space in the bag, suitable for the use of travel type treatment instruments. 2. Button Type: Connection of electrode wire and TENS machine is more convenient and safe, and there will be less short circuit or connection failure. 3. Suitable: Can simulate acupuncture, massage, massage, hammering, scraping and other effects by co