Mircom’s QMT-5300A Master Firefighters’ Telephone may be used either alone as a single zone system (using the QMT-5300A by itself), or as a multi-zoned system (with the QZT-5302 Zone Adder Modules). Two slide-in labels are supplied with the QMT-5300A: the NP-735 label is used for single zone (with connect label) and the NP-736 label issued for multi-zone (with clear all label).