Veridian Healthcare TENS Unit Single Channel - EachAbout TENS + remote Pain Management Solution TENS kit (1 Unit) Electronic nerve stimulation provides temporary pain relief to shoulders, waist, back, neck, arms or legs Small pad is 3 x 2 inches and large pad is 6 1 2 x 3 1 2 inches: Both are activated wirelessly There are four pulse modes and 20 intensity levels Gel style electrode pads Reusable electrodes can be used up to 50 times 30 minute fixed timer so device will shut off automatically Single