The Aprilaire 8448 Programmable Heat Pump Thermostat 8400 Series is a white, rectangular-shaped thermostat designed for wall mounting. It features digital control style, programmability, and a 1-year manufacturer warranty. The thermostat is compatible with heat pumps and includes batteries for operation. With smart home compatibility, low voltage protection, and resistance properties, this thermostat offers convenient and efficient temperature control for your home.