The Z-Wave Thermostat (GC-TBZ48) is a programmable, Z-Wave communicating thermostat. It can be powered using 24VAC (if both R & C wires are available at the thermostat), or using four (4) AA batteries. Using Z-Wave technology, end users have the ability to use the Helix Automation Platform to control the thermostat, configure programming settings, as well as to display current conditions in the home or office. Features include: A fixed format display with white backlight. Heating and Cooling setup display options. System mode ( OFF, Heat, Cool, Auto, E-Heat). Compatible with 24 VAC gas, oil or electric heating and air conditioning systems; or gas millivolt heating systems. DO NOT USE ON 120 VAC SYSTEMS.