Apartment stations shall be Alpha Communications® / TekTone model IR203C, IR204C, or IR205C or approved equal, equipped with momentary action pushbuttons for TALK, LISTEN, and DOOR operation. Each push-button hall have both English and Universal Graphic Symbol imprinting. The speaker/microphone shall be a 2.5" high-sensitivity type with voice-frequency response. Screw terminal connections shall be provided for positive wiring termination. The station shall be molded of high-impact, flame retardant ABS plastic, in a fog white finish.
Required wiring shall be only 2 common - 1 selective wires for the IR203C; 3 common - 1 selective for the IR204C; and 4 common - 1 selective for the IR205C station. See actual system wiring diagram for complete details.