Alpha IA543 5/4/3 Wire Apartment Intercom Amplifier, 2 Tones, Requires 16VAC Transformer (SS102, SS105B, SS106, T1640 or equal)

Brand: Alpha Communications
ADI #:AY-IA543 Model #: IA543  Name: Alpha IA543 5/4/3 Wire Apartment Intercom Amplifier, 2 Tones, Requires 16VAC Transformer (SS102, SS105B, SS106, T1640 or equal)