This is the only home device that combines electrostimulation with heat therapy for drug-free pain relief. Employing transcutaneous electrical nerve stimulation (TENS), an approach widely embraced by physical therapists and other medical professionals, the system delivers harmless electrical pulses to the treatment area to block pain signals from reaching the brain. Its heat setting helps loosen knots and speed circulation, accelerating the body’s repair of the injury—clinical rests have revealed that combining heat and cold with TENS is four times as effective for treating pain. A tethered controller lets users select one of six treatment modes and 11 intensity settings. Includes two reusable electrode pads. A 40-minute charge via the included adapter (can also run on four AA batteries (required) or plug into AC) provides hot/cold/TENS treatments that last between 10 and 30 minutes depending upon the desired setting. 6" H x 3 1/2" W x 2 1/2" D. (2 oz.)