The annunciator/control panel(s) shall be Cornell A-4000 series or approved equal, with controls for tone hi-low lamp test, power On LED, plus indicator LEDs for EMERGENCY and ROUTINE calls. LEDs shall be provided for room annunciation, with designation strips. An audible signal shall be provided. The A-4000 series master annunciator shall be finished in natural anodized aluminum finish and shall be flush, surface or desk mounted, depending on the housing being provided.