Model GC-TBZ48 is a battery powered Z-wave thermostat that connects to all Z-Wave hubs, including the 2GIG GC2 panel giving you control over your home’s comfort wherever you are. This model is designed to be incredibly easy to install and includes a front loading battery compartment to hold 4 "AA" batteries to power the thermostat for two full years, or it can be powered by the HVAC systems 24 VAC "C" wire. The 7 character scrolling display makes programming simple.