The AI-DA-4DS is a silver door station that connects via two wires to the AI-DA-1MD or AI-DB-1MD masters. The AI-DA-4DS features a 12V AC output for door strike connection, selective call buttons and illuminated directories. Pressing a call button on the AI-DA-4DS rings a specific AI-DA-1MD or AI-DB-1MD master. Communication at the AI-DA-4DS is hands free.