AiPhone TC-10M A 10 call handset master console has an expandable single or multiple audio door communication and an optional selective door release control.
Features:
One or dual-master configuration
Call extension iER-2 allows incoming call tone to be heard at a remote location
Master station can call sub by tone, and optional external buzzer
TB-AD1 adaptor connects TC-M with an IE/IF Series audio door station (up to 3)
TC-20G or TC-40G add-on selector connects additional TB-SE subs, allowing system expansion