|  |  | External Signaling Relay |  |  | Ring a standard doorbell or activate a separate device when a call is placed from a door station (LEF or LEF-C Series) |  |  | In high noise areas or where a light is needed, or to activate a bell, buzzer, or light when calling between handset-type intercoms (TD-H Series Selective Calling and Paging system) (IE-8 Series Selective Calling Handset system) |
|