A simple tens unit, just point to the area of your pain and turn the unit on. Single channel, 4 preset programs, set program according to body part to be treated, 0-60 mA, 80 Hz, 300s, symetrical biphasic square pulse. Includes unit, case, 1 snap lead wire, 1 pkg snap reusable electrodes, device necklace, manual. 3 Year Warranty, 2 - AA alkaline batteries.