This Harmony ZBY circular legend for emergency switching off function has yellow background, and a diameter of 90mm.It is compatible with Harmony XB4, XB5 and XB7 push buttons and pilot lights.This circular legend provides clear labelling of your emergency switching off units.It is supplied with blank plate for custom engraving and is compatible with any standard Harmony emergency stop or switching off unit.It provides clear and resilient symbol marking on the label, with high contrast.