Warning:<br />Current must never flow through the heart. Do not use if you have a pacemaker&#44; are pregnant&#44; if you suffer from epilepsy&#44; or on any broken or inflamed skin.<br /><br />Mystim Self Adhesive Electrode Pads for TENS Units&nbsp;40mm x 40mm. Self-adhesive electrodes&#44; re-usable&#44; suitable for all power units with a 2mm plug.