The result is a functional intercom that you could use pretty much anywhere! The circuit to make two phones work as an intercom is extremely simple. You can see in the picture below, all you ...

An all-in-one door intercom platform to transform building access and communication by integrating a video door intercom system with the latest in access control.Robust access control ...

While the front office could connect with the classroom through its dated one‑way intercom system, teachers could not communicate with the front office from the classroom. In the event of a classroom ...