Did you know that a TENS unit can help reduce the pain of migraine headaches and menstruation? The Medi-Stim ComfyTENS Plus can. It has 12 presets for various types of pain. Neck pain, back pain, OA knee pain, shoulder pain, sciatic pain, and many other types. It can even help reduce nausea and motion sickness! This TENS unit is so easy to use. All you need to do is place the electrodes to the part of your body that you want to treat, choose your preset program then let the ComfyTENS plus do its job.