The system can support one (1) master station per system only. When a remote station is activated, the master annunciator will sound an electronic tone and will light, indicating the location of the call. The tone signal can be silenced at the master station. The individual switch/light will remain lighted until the remote station is reset at the point of origination, or when answered by voice from the master station (for remotes with voice capability only).
The master annunciator is modular (in multiples of 20 lights) and can desk mounted only. Each master has a built-in amplifier with voice volume controls, nurse-follower function, and group call.