NuTone Intercom System 

NRS104WH 4 Wire Room Station (White)

Nutone NRS104WH Retrofit 4-Wire Standard Remote Room Station for NM100 Master Unit. Retrofit 4-Wire Standard Remote Room Station for NM100 Upgrade Intercom System. Remote scan room station with volume control, talk/listen, remote volume and source control Features remote scan for CD player operation and AM/FM preset operation Connects using existing wire