List of featured suppliers of DOOR ENTRY SYSTEMS Audio on Building Products Index
A door entry system, audio is a type of security system commonly used in buildings and homes. It allows the occupant to speak to and hear the person outside the door before deciding whether or not to grant them access. The system typically includes a speaker and microphone at the door and an intercom inside the building or home. These systems can also be integrated with other security measures, such as video monitoring or keyless entry.
