61 BELL SYSTEMS 61 SPEECH UNIT " NEW STYLE "

Speech unit model 61 This compact unit is fitted to the entrance panel on all our current door entry systems (except as indicated below). The unit provides two-way speech and has an individual volume control for both microphone and speaker. This universal product can be powered from either 12V AC or 12V DC depending on the model of telephone used.
 
Dimensions (mm): H 97 x W 58 x D 24