Divide your central air/heat system into up to four different zones for independent temperatures in various areas of your home. The Wall Display Unit for ZCV Zone Controls shows the accurate temperature in a specific zone as well as any current activity of your system's heating or cooling. In addition, any connected Wall Display Unit can act as a programming station for the HVAC 4-Zone Controller (sold separately), which manages your HVAC system, whether it's a standard or heat-pump system. The Wall Display Unit looks like a traditional thermostat and is the wall-mounted user interface for each zone of the your system. It provides visual display of temperature, set points and modes, the control pushbuttons, and the zone temperature sensor. The Wall Display Unit is connected to the HVAC 4-Zone Controller via 4-wire cable, which can be existing thermostat wires in retrofit applications or cat. 5 wiring in new construction. If you don't need a Wall Display Unit in a particular zone, you can install a remote temperature sensor instead. This unit will trigger the same heating and cooling response for the zone, but no manual control or programming will be able to be performed from that particular zone. An LCD Wall Display Unit is also available for programming and control of a single individual zone. The Wall Display Unit can also show outside temperature information from a sensor attached to the ZCV Outside Temp Sensor Input or from outside temperature data received from the network. Sensors are sold separately.