Tens acupuncture digital therapy machine has 4 pads, 3 x AAA batteries, vibrate thump / shiatsu / massage / pat and scrape therapy massage modes, size 15.3 x 7 x 1.8 cm, infrared physical therapy electrodes. This machine helps to improve blood circulation, relieve pain and promote metabolism. It's suitable for waist / shoulders / legs / foot massage and physical therapy.