This is the therapy belt that uses transcutaneous electrical nerve stimulation (TENS) and electrical muscle stimulation (EMS) to help ease pain and improve muscle strength in the back. The TENS therapy provides drug-free pain relief by stimulating the nerves and blocking pain signals to the brain, while EMS engages muscle contractions to accelerate strengthening and rehab. Unlike similar devices in the marketplace, this belt uses a proprietary auto-modulating pulse technology that provides over 300 types of stimulation—preventing the body from becoming accustomed to and insusceptible to the same treatment pattern. The padded belt has built-in lumbar support and secures with hook-and-loop fasteners. Requires two AAA batteries. Fits waists 25" to 53". Not for use by those with pacemakers.