Transcutaneous Electrical Nerve Stimulation or Tens Machines is a non-invasive, non-pharmacological method of pain relief through electrical stimulation. Application of TENS as an auxiliary therapeutic method in management of acute and chronic pain of various abdominal and thoracic surgeries has occurred since 1970. Our products to assist in TENS therapy include: 2 Channel Tens Machine – Mini LCD Tens, 4 Ch Tens Unit / Stim-04, 4 Channel TENS Electrotherapy LCD, and 4 Channel Tens with Sticky Pads.