This Harmony ZBY circular legend has yellow background and is marked with “NOT HALT” lettering.It is compatible with Harmony XB4 and XB5 push buttons and pilot lights.This circular legend provides clear labelling of your emergency stop devices units.It is supplied ready engraved with a marking relevant to machine operation and is compatible with Harmony emergency stop or switching off unit.It provides clear and resilient symbol marking on the label, with high contrast.