Natural drug free pain relief using electromassage therapy (TENS). Provides temporary relief of pain associated with sore and aching muscles due to strain from exercise or normal household and work activities. Incorporates the same technology used by healthcare professionals easily and safely in your own home. Designed with a unique lock button to protect yourself from accidential changes when placed in your pocket. Please note that all devices have a plastic protection on them, just remove the plastic and there would be no scratches seen.When removing the plastic, please pull plastic downward and not straight up as this can remove the entire screen cover. If this happens just place it back and it will not come off again as the protective cover is very tight. Provides temporary pain relief using electromassage therapy (TENS) Easy to use with 8 computer controlled programs 30 intensity levels with 2 channels and Timer (5 - 95min and continuous) Includes everything needed for immediate use FDA cleared and prescription free for home use