KB Tags: 1 door 2 masters

1 LE-SSR Door Station, 2 LEM-1 Answering Stations

1 LE-D Door Station, 2 LEM-1DL Answering Stations, with External Signaling

1 LE-D Door Station, 2 LEM-1DL Answering Stations

1 LE-D Door Station, 2 LEM-1DLC Answering Stations