Smart thermostat add-on for use with versions V2, V3 or V3+ of Tado Starter Kits (including internet bridge). Allows individual control of multiple rooms, zones and underfloor heating using the Tado app. Can be upgraded to multi-room control for extra comfort and energy savings. Compatible with 95% of heating systems. Works with - Amazon Alexa - Apple HomeKit - Google Home - iOS App - Android App 5-25°C Temperature Range Suitable for All Boilers Battery-Powered Digital Display 1 Year Guarantee Smartphone Control Smart Hub Required Works with - Amazon Alexa - Apple HomeKit - Google Home - iOS App - Android App 5-25°C Temperature Range Suitable for All Boilers Battery-Powered Digital Display 1 Year Guarantee Smartphone Control Smart Hub Required