Key Features 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 device. What\'s in the Box . Smart Radiator Thermostat (horizontal mounting)Adapters Three different adapters2 AA batteries.. .