Box opened but never removed. The Vaillant SensoComfort VRC 720f/3 Wireless Programmable Thermostat is a wall-mounted digital controller made of plastic. It features a 3.5-inch display and offers wireless connectivity for easy installation. This programmable thermostat is compatible with universal smart home systems, making it a versatile option for heating and cooling control in any home. With its sleek design and convenient control features, the Vaillant SensoComfort VRC 720f/3 is a reliable choice for optimizing your home's temperature settings.