An intercom (intercommunication device), talkback or doorphone is a stand-alone voice communications system for use within a building.
LEM-1DLS audio door answer and release system by Aiphone
$263.50
Aiphone, JVS-1V Video Intercom Box Set with Door Release
$773.50
Doorbird D1101V Video Door Station, Surface-Mount, Stainless, 1080p
$924.04
DoorBird A1101-W Indoor IP Video Station, Surface Mounting, White
$796.72
DoorBird, D31TDH Multi-Tenant Video Intercom Door Station, Touch Display, Horizontal
$6,540.52