Manufacturer Name: Resideo Product Number: TH5220D1029 OEM Part Number: TH5220D1029 The Resideo TH5220D1029 FocusPro is a versatile non-programmable digital thermostat that can control up to two heat and cooling stages, making it perfect for multi-stage HVAC systems. Its dual power supply options-battery (using two AA batteries) or hardwired-provide flexibility in installation. https://www.partshnc.com/th5220d1029-resideo-non-prog2h2clarge-backlit