The circuit provides a simple illustration of a door phone intercom system having a two-way communication using the features of LM386 amplifier. Intercom – short for intercommunication, is an ...

In most business environments, telephone calls are typically handled by a receptionist or directed to specific extensions using an internal intercom system. The technology enabling this seamless ...

Inglewood, CA – DoorKing is introducing the model 2112evolve Video Telephone Entry System to its line of telephone entry and access control products. The cloud based system can store virtually an ...

DoorKing's 1837 90 Series telephone entry and access control system stores up to 3,000 phone numbers and 8,000 device codes and can be expanded to control up to 48 wired access points with optional ...