Battery powered Z-wave Thermostat designed to be easy to install. Front loading battery compartment holds 4 "AA" batteries to power the thermostat for two full years, or it can be powered by the HVAC systems 24 VAC "C" wire. Scrolling display. Works with most contemporary Central HVAC systems, whether standard or heat pump. A great solution for all retrofit or new construction needs. Easy integration with Vera.