[ A New Choice for Drug-free Pain Relief ] - The TENS Unit Machine is used for the symptomatic relief of chronic intractable pain. The ems muscle stimulator can relief of pain associated with sore and aching muscles in the arm. shoulder. neck. back. waist. abdomen, hip and leg due to strain from exercise or normal household and work activities. It helps relieve your body pain instead of taking pills. A new choice that will provide instant muscle pain relief. [ Professional Pain Reliever ] - The medical grade tens unit has passed professional medical certification test, can relax muscle spasm and increase blood flow circulation. It is used for the symptomatic relief of chronic intractable pain and the temporary relief of pain associated withsore and aching muscles in the arm, shoulder, neck, back, waist, abdomen, hip and leg due to strain from exercise or normal household and work activities, It's a good back pain relief products. It also a ems muscle stimulator to post-surgical stimulation of calf muscles to prevent venous thrombosis. [22 Programs & 40 Intensity] - The BHK-TENS muscle stimulator is equipped with 2 output channels and 22 programs, also designed with 40 intensity levels, offering you more options for relief therapy without shock feelings. Different programs use different pulse rate (Hz) and width (uS), you can find them on screen, so can easily find the most suitable program and intensity for needs. Your physiotherapist may recommend it to you.