TENS - EMS is a unique device that uses electrical impulses via TENS and EMS for pain relief and muscle recovery. TENS affects nerves and EMS works to strengthen and relax muscles through muscle contractions. Modern bioelectrical technology completely without side effects and in a handy format – perfect for home use. Use electrotherapy for back pain, menstrual cramps, pregnancy, chronic pain, joint pain, migraines, depression and to stimulate the muscles during or after exercise. 12 programs to choose from - 6 TENS programs + 6 EMS programs. Lifetime warranty. Use at least 30 minutes at a time for the desired effect