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The External Presentation Unit 1728 is a compact sized enclosure rated to IP61 (if fitted with the supplementary “O” ring gasket). The unit is intended for pre-warning, co-incidence, fire (and heavy smoke/heat) alarm presentation. If there are two or more alarms in the system, the operator can scroll amongst them but the alarms cannot be reset via this unit. There is no front panel door which means the unit can be accessed directly when required. The push buttons are disabled until they are supposed to be used.