This is the only device that combines infrared heat with transcutaneous electrical nerve stimulation (TENS) and electrical muscle stimulation (EMS) to help ease pain and improve muscle strength. The deep-penetrating infrared heat promotes faster healing and relief of discomfort from exercise, injuries, cramps, and chronic conditions. TENS therapy provides drug-free relief by stimulating nerves and blocking pain signals to the brain, while EMS engages muscle contractions to accelerate strengthening and rehab. Three settings let you choose TENS and EMS with or without heat, or heat only. Includes two sets of electrode pads. Charges via USB. Not for use by those with pacemakers. 5 3/4" H x 3 1/4" W x 1" D. (1 lb.)