Veridian Healthcare® TENS Unit Single-Channel (1226082_EA) 1/EAElectronic 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 channel output 1 year limited warranty