Purchased off Amazon, received one as a gift then missed the return window to return this one. Selling for 25% off the Amazon price Completely new in box and unopened Tens Unit Muscle Stimulator Machine - Dual Channel Electronic Pulse Massager, Tens EMS Machine for Pain Relief Therapy with 10 Electrode Tens Unit Replacement Pads (2"x2") 22 Modes, 40 Levels Intensity for Pain and Muscle Relief. TENS unit helps relieve pain associated with sore and aching muscles in the shoulder, waist, back, neck, upper / lower extremities(arm/leg) due to strain from exercise, overwork or normal household work activities. Brand is NOT Omron, used for exposure