Abstract: A smoke and carbon monoxide detector for mounting upon a wall, having a housing having a front face. A clock having clock hands and clock indicia is present on the front face. The detector comprises a smoke detector element, a carbon monoxide detector element, and has an annunciator which sounds upon the presence of smoke or carbon monoxide. A deactivation button allows the annunciator to be temporarily deactivated in the event of a clearly false warning. The deactivation button also initiates a timing operation so that the annunciator is automatically re-enabled at the end of a predetermined time interval.