1)All in one: 2-wire non-polarity cable, easy to install.
2)Support max. 128 apartments.
3)Central power supply: only one power supply for the whole system. Fewer cables save cost.
4)Support intercom between apartments and inner call between rooms.
5)Design your own GUI menu, easy operation by touch screen monitor and touch screen door station.
Perfect to replace old buildings and good choice for new project.
Replace old 2 wire audio system easily, no need to install cable again.