This is the cordless electrical muscle stimulator (EMS) that soothes sore muscles without being tethered to a power outlet. Using the same technology employed by physical therapists, the battery powered device's electrodes emit low-voltage electrical pulses that stimulate muscles, facilitate blood flow and oxygen to injuries, and reduce lactic acid, relieving muscle aches and pain. About the size of a wristwatch, the unit attaches anywhere on the body with a reusable self-adhesive pad and can be worn under clothing while you work or during light exercise without hindering movements. It has eight levels of intensity that are easily adjusted using the three-button control panel and LCD. Includes a CR2032 battery that provides up to 20 hours of use and a zippered travel case. 2 1/2" D x 5" L x 1/2" H. (3/4 oz.)