Excellent Adhesive Reusable Electrodes: The replacement TENS pads are made with upgraded industry-leading adhesive which provides excellent self-stick performance and is easy to clean..Universal Compatibility: Standard 2mm pin connector of electrode pads fits most TENS / EMS units, which makes it easier for you to find compatible TENS unit muscle stimulator & accessories..Suitable for All Parts: We offer 2 sizes of TENS pads(20pcs 1.8"x1.8",10pcs 2.4"x4"). The TENS machine pads are applied to parts of the body, such as the back, shoulder, neck, and leg. The electrodes provide better conductivity with 2mm pin connector and easy installation..Soft & Safe: The electrode pads are certified by professional organizations and safe to use. With a non-irritating latex-free design, no need to worry about skin sensitization and other problems..How to Use: Please clean the skin first to remove the oil and dirt from the skin. Otherwise, it will not stick well if any oil is left on your skin. After each use, place the pads in their original packaging. If the stickiness becomes weak after a few uses, just wash it with water to restore the stickiness.