Think the back cover is missing of the thermostat. The HIVE Active Heating & Hot Water Thermostat is a sleek square-shaped device controlled via the Hive app. It is compatible with central heating radiators and can be integrated with various smart home systems such as Google Home/Assistant, Amazon Alexa, and Siri. With programmable settings and the ability to control heating and hot water systems, this thermostat offers convenience and energy efficiency for home owners looking to enhance their home heating experience.