The Beurer EM59 Digital TENS/EMS Device with Heat provides innovative 3-in-1 pain relief. The electrostimulation device can be used for pain relief without side effects, as well as for muscle stimulation. In addition to these two functions, the Beurer TENS Device also has various massage programs and the addition of a soothing heat function which can be used individually or combined with an EMS/TENS program. Transcutaneous electrical nerve stimulation (TENS) uses electrical impulses. For pain therapy in cases of cramps, injury, or chronic pain. Our customer service is right here in the USA! Feel free to give us a call at +1(800) 536-0366.