Target pain at its source with the help of this TENS single-channel pain relief system. Simply surround your muscle or joint pain with the electrode pads and choose from six preset body programs tailored for specific areas. The device is designed to be used for temporary relief of pain associated with sore and aching muscles in the shoulder, waist, back, neck, upper extremities (arm), and lower extremities (leg) due to strain from exercise or normal household work activities. From Carex.