What is TENS? Transcutaneous electrical nerve stimulation(TENS) therapy is a clinically proven,easy to use,safe alternative to pain killing drugs and is widely prescribed by physicians around the world. TENS can be applied to relieve both acute and chronic pain and its is in the treatment of the latter(particularly chronic back pain) where it has won most acceptance in recent years. As a therapy form,it is suitable for most patients and particularly useful in situations where sensitivity to analgesics exists. Our product also use the theory of TENS. Pecification: 1.Mode: 10 modes 2.Stength intensity:150 level 3.Power: Built-in li-ion battery 4.Thigh cirference: