OMRON's Standard Long Life Pads are durable, comfortable and gently adhere to your skin. Exclusively used with the OMRON TENS Units, the electrode cords snap easily into place on to each pad. Tested in research and development laboratories, the Long Life Pads may be reusable up to 150 times or five months. Just simply rinse the sticky side of the electrodes with only water and let them air dry. These replacement Long Life Pads are prescription free and last up to 5 months! The Standard Size Long Life Pads are only compatible with OMRON TENS units: PM3029, BP3030, PM3031, PM3032,PM400,PM500