EM59 is a digital TENS/EMS unit with an innovative heat and massage function. The ultimate device for drug-free pain relief and muscle recovery. The heat function can be used alone or combined with the TENS or EMS program. Choose from one of the 44 treatment programs or customize 6 additional programs to your comfort level. TENS provides targeted pain relief by blocking pain signals sent to the brain. The EMS function can be used to tone muscles or provide a gentle massage. Heat can help relax muscles during the EMS massage or help relieve pain during TENS treatment. Features a rechargeable battery and includes 4 electrodes.