Like new, barely used Foundation Brand Comfy Stim Digital TENS and EMS pain relief device. Acts as an electric muscle massager and muscle relaxant for back pain, neck pain, nerve pain, and muscle pain; And as a nerve stimulator and electric massager with independent dual channels that control four(4) TENS unit pads (electrodes) for targeted pain relief. Unit comes complete with 20 2" x 2" self adhesive electrode pads.