Spec Sheet Preview: The Alpha Communications® / TekTone IR150SSF (flush) and IR150SS/SF (surface) Remote Call Stations may be used to provide efficient communications to the NC150R (and/or NC150N) Area of Rescue Master Control Station(s). IR150SSF and/or IR150SS/SF 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 low-profile Red momentary pushbutton. Solid state indicators on the facepla …