This programmable thermostat is compatible with most HVAC systems, including 24VAC standard gas or electric, millivolt, or heat pump systems. The TBZ500BL ZWave Wireless Digital Thermostat from Ecolink supports flexible installations with hardwired 24VAC using both the C wire and the R wire where available or battery operation with 4 AA alkaline batteries for 24 months. Works with popular home hubs like SmartThings, Homeseer, Hometroller, Vera and Ezlo. When connected to a ZWave system, the system can read current settings and control the set points, etc. Note there is no on board schedule as it is assumed to be controlled by the zwave primary controller/hub/alarm/software.