Dr Physio Tens Electronic Pulse Massager 1015 is an efficient massager and aids pain relief in the neck, knees, joints, back and other sports injuries. It comes with 5 pre-programmed modes of Knocking, Acupuncture, Cupping, Tapping, Shiatsu-Kneading that can help to relieve most kinds of pain. This muscle stimulator works by sending electrical pulses to the Central Nervous System to aid in pain relief, just the way painkillers would work.