The Pain Therapy System Pro is a dual port T.E.N.S device designed to help relieve muscle tension and pain. Equipped with 6 different modes for a total of 24 massage techniques, and a timer for 20, 30 or 40 minutes, this unit allows you to customize your treatment anywhere on the body. With the dual port design, you can treat two areas of the body at the same time on different intensity levels, maximizing your treatment while saving your time. What's Included: (8) Replacement Gel Pads (2) Large Flex Tone Pads Dr. Ho 4 Pad Pain Therapy System Pro A/C Adapter Personal Carrying Case Instruction DVD and Manual Dr. Ho's Pad Placement Chart Item has NOT been used yet