Elle TENS Plus is a state of the art efficient method of drug free pain relief and can be used in conjuction with out pain relief for labour. The TENS machine sends small, safe pulses of electrical current via the leads to the pads of the skin. The pulses pass through your skin into your muscles and tissues via nerve fibres. This gives you a gentle tingling/buzzing sensation, which may be stronger or weaker depedning on the setting level.