Beurer EM 50 Period Pain RelieverThe Menstrual Relax is a self adhesive TENS device with a heat function to provide pain relief for menstrual discomfort and pain caused by endometriosis. TENS (transcutaneous electrical nerve stimulation) is the electrical stimulation of nerves through the skin. The transmission of pain into the nerve fibres is suppressed and the excretion of endorphins in the body is increased. These reduce the sensation of pain due to their effect in the central