Bests & Worsts Reviews from Amazon

This gets a 1 star because it is misidentified on Amazon. Although the title on Amazon says TENS, the unit that arrived never mentions that phrase and instead makes clear that this is an Electronic Muscle Stimulator (EMS). While an EMS unit can have very valuable uses, it functions differently from a Transcutaneous Electrical Nerve Stimulator (TENS) unit. A TENS unit stimulates the nerve endings to temporarily mask pain while the EMS unit stimulates the muscles to improve muscular function (often reducing pain as well, but its primary focus is healing). But the two units work on different electrical currencies, and are designed to do different things. Those who need a TENS unit may not want to be using an EMS unit because stimulating the muscle may increase the pain. On this unit, there is a "beat" function that attempts to replicate the same concept as a TENS unit, but it does not use the same electrical current and it only lasts for 15 minutes per session, which is great for EMS but not great for TENS uses. Bottom line . . . if you're looking for an EMS, this may be great. But if you are looking for a true TENS unit, this is not for you.