Universal 4+N Audio Kits
The electronic door entry kits include everything necessary for assembly: entrance panel, flush-mounting box, telephones, and power supply. The cable is not included in the kits.
These kits are analog systems, also called conventional or technically (4+N). To wire these kits, 4 common wires + N number of wires are needed for each house. In other words, a kit with only 1 housing requires 4 common wires + 1. Total 5 wires. A kit for 10 dwellings, you need 4 common wires + 10 wires. Total 14 threads.
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4+N Analog Audio Kits