The TECOMBO TENS/EMS Combo unit is a beneficial aid for physical therapy or rehabilitation. Switch between the TENS mode and the EMS mode to reap the benefits from the electrical stimulation. The TENS mode is intended for use in pain reduction, when dealing with chronic pain. The EMS mode will help tone and strengthen the targeted area prevent muscle atrophy. The TECOMBO's easy-to-operate digital control let's you select the treatment method.