Key Features . Add-on for tado° Starter KitsIndividual radiator control for maximum comfortManage all zones and settings within the tado° appCompatible with iOS / Android / WindowsWorks with Apple HomeKit / Google Assistant / Amazon Alexa The tado° Smart Radiator Thermostat Add-on is compatible with the tado° Smart Radiator Starter Kit or the Smart Thermostat Starter Kit (v3) allowing you to expand your heating control throughout your home. Connecting via the Internet Bridge (sold separately) it can be controlled from the app or manually from the Thermostat itself. This means you can control each individual radiator for a comfortable temperature in each room. Please note. . A compatible hub (sold separately) is required to connect your smart home deviceWhat\'s in the Box . Vertical Mounting Smart Radiator ThermostatVarious Adapters2 x AA Batteries. .