Omron PM311 TENS Nerve Muscle Heat Pain Pro Stimulator ElectrotherapyAbout the product Utilizes Transcutaneous Electrical Nerve Stimulation (TENS) technology used by physical therapists and chiropractors for more than 30 years Features 3 pre set pain programs (Arm Shoulder, Lower Back and Leg Foot) and 2 massage like modes (Knead and Steady) each with 10 adjustable levels of power intensity to help relieve pain almost anywhere Small, portable, easy to use, and can be used discretely anywhere Includes comfortable, self