Offers intercoms for a variety of purposes. They are intended to provide maximum comfort and safety to residents and visitors to buildings. Intercoms are available from one to one (1-1) connection to 1, 2, 3 to 8 family models. Medium series intercom is designed for large system capacities of up to 40 total intercom master and/or remote stations. Large Series intercom are designed for large system capacities of up to 240 intercom master and/or remote stations, expandable up to 693 in a single system.