The TENS 2-in-1 Physiotherapy Alevia by ProActive is a 2-in-1 (TENS and EMS) device that gives you the ability to fully customize treatment options or choose one of the 18 pre-set programs. It has a large, easy-to-read LCD and includes all accessories. The Alevia Dual channel TENS Electro-Stimulator relieves pain in 2 ways: TENS (Transcutaneous Nerve Stimulation) stimulates or numbs nerves. EMS (Electrical Muscle Stimulation) prevents atrophy.