This is the cordless home electrotherapy system that treats two areas simultaneously (or independently) for fast, drug-free pain relief. Addressing joint pain associated with arthritis and muscle aches, the device employs Transcutaneous Electrical Nerve Stimulation (TENS) therapy. When the self-adhesive electrode pads are placed around sore spots, they send harmless low-frequency electrical pulses into the tissue that block pain signals passing through nerves to the brain. According to the American Physical Therapy Association, TENS therapy can be an effective element of pain management for low-intensity discomfort, such as back pain and muscle soreness in the extremities. The tethered controller lets you easily choose from 10 treatment modes with 10 intensity levels. System comes with six electrode pads and a carrying bag. A 6 1/2-hour charge via its AC adapter provides up to 12 hours of power. Not for use with pacemakers. 5 1/2" L x 2 3/4" W x 3/4" D. (4 oz.)