This is a Carrier Bryant HK42FZ011 control board that has been tested and is ready to use. It is compatible with Carrier, Payne, and Bryant brands and is specifically designed for use with furnace systems. This control board is a crucial component for your furnace system and ensures that it operates efficiently and effectively. It is made by a reputable brand and is compatible with several other trusted brands in the industry. With this control board, you can trust that your furnace system will operate seamlessly without any issues.