The Aiphone NA-T/A Handset Sub Station is used with the NEM and NEM-A Lamp Memory Intercom Systems. It can be used as a standalone unit or with any open voice sub station (calling from the sub station becomes inoperable).
Simple operation: Telephone-type substation with automatic call-in
Direct voice call from the master station
Two wires from sub station to the master unit
2-way open voice communication can be added using standard NA-A, NA-AN, or NB-L sub stations