So many settings. Once you find the one. It's perfect.

By sheer coincidence I hurt my back moving music equip. 2 days before my unit arrived. I Opened it immediately and placed the 2 larger pads on my back. I found the perfect one and let it go for almost an hour. It surprisingly did very well and loosened my spasming back for a good hour or so. This unit would be well used after a good workout or distance run to soothe those sore muscles. It has a setting for every need. I have used it for over 3 hours and the battery still says fully charged. Place a few drops of water on the pad to renew them. Plus they remove gently without pulling your skin off