The Alpha Communications® / TekTone IR150SS (flush) and IR150SS/S (surface) Remote Call Stations may be used to provide efficient communications to the NC150R (and/or NC150N) Area of Rescue Master Control Station(s). IR150SS and/or IR150SS/S Remote Call Stations are located in areas of rescue assistance, to provide two-way hands-free communication to a central location from which help may be summoned. Calls are placed by pressing a large, 2.36" (60mm) mushroom style momentary pushbutton. Solid state indicators on the faceplate indicate when a call has been placed and when the intercom is in use.