A TENS Unit for Home use for Pains in Multiple parts of the body. Omron Pain Relief Pro Electrotherapy TENS Unit PM3031 is a versatile device that various options for pain relief. Select one of eight preset modes for adjusting to your therapy needs. These preset modes include pain relief and relaxing massages for Joints, Lower back, and extremities. This remarkable TENS device helps alleviate joint and muscle ailments with OTC availability in about 15-30 Minutes.