The Paingone Plus TENS Pen PGPLUS is an automatic version of the original Paingone TENS Pen, offering easier and quicker therapy. It automatically delivers electrical impulses when you hold down the activating button. The device is powered by a replaceable AAA battery. Anyone suffering from pain, but especially those who find it difficult or tiring to repeatedly press the button on Paingone will appreciate the automatic operation here. Use Paingone Plus to treat acute or chronic pain, such as back pain, arthritis, tennis elbow, fibromyalgia, sports injuries, aching muscles, sciatica, lumbago, post operative pain, and more. TENS is an established therapy using electrical stimulation to naturally relieve pain and tension.