GT1A AUDIO 2 WIRE HANDSFREE STATION FOR GT SYSTEM AIPHONE GT1AOverview The GT 1A is an audio only tenant station for the GT series Multi Unit entry system. It is equipped with a Talk, Door Release, and optional Service Button. When a visitor calls, the tenant station rings and is answered by one touch of the Talk button. The GT 1A also has the capability of calling the Concierge Security Guard station(s), turning on a light while speaking with a visitor at the entrance, receiving an emergency tone from a pull