Audio door telephone When a visitor arrives, whether the resident is at home, in the office or on business trip, the door can be opened by remote control through the telephone or mobile phone. The audio door telephone device is the product upgrade of the traditional intercom access control system. It does not need wiring and is easy to install and maintain. It can use both local telephone lines and internal extension lines.

The audio door telephone system is mainly composed of host, extension, UPS power supply, electric control lock and door closer. According to the type, it can be divided into direct press type, digital type, digital household communication, direct press type visual intercom, digital visual intercom, digital household communication visual intercom, etc.