The Resideo TTHWFD Wireless Digital Thermostat Boiler is a wall-mounted thermostat that uses temperature sensor technology for precise control. It features a digital control style and is powered by batteries, making it convenient and easy to use. The programmable thermostat allows for customized heating schedules, while its wireless capabilities make installation simple. With a sleek white design and compatibility with various heating systems, the Resideo TTHWFD is a versatile and efficient choice for controlling your home's heating.