Intercom products have a wide range of applications. They are used in schools, all facets of residential buildings, and office and commercial buildings. The products range from simple do-it-yourself door answering units to sophisticated video entry security systems, complex microprocessor-based commercial systems, and luxury condominium security/communication systems. As well, intercom is an integral part of any school’s P.A. system to enable communications from office to classrooms and between classrooms. Advance Connexions supplies and installs all of the aforementioned applications.