Horstmann HRT Series Wireless Z-Wave Battery Operated Electronic Room Thermostat is designed to be easy to install in combination with an ASR-ZW receiver to provide excellent control of room temperature. It is particularly useful for installing a room thermostat into existing systems as no cable runs are needed. The HRT4-ZW features further functionality that may be utilised by incorporation in a larger Z-Wave system. The HRT4-ZW may receive set point temperature messages from another controller and may be used as a temperature sensor.