FeaturesWorks with a tado° Starter Kit and provides room-by-room scheduling and control from the tado° appEasy to self-install when replacing existing Thermostatic Radiator Valves (TRVs)Save energy by only heating the rooms you are usingAchieve your perfect temperature in every roomWorks with Amazon Alexa/Apple HomeKit/Google Assistant.The Tado° Additional Smart Radiator Thermostat - Quattro Pack Add-on for Multi-Room Control is your Climate Assistant that ensures a comfortable & healthy climate, whilst considerably reducing your energy consumption.Never heat your whole home again! tado Smart Radiator Thermostats can replace your existing thermostatic radiator valves and provide room-by-room scheduling and control, enabling your radiators to individually call for heat, so you can enjoy greater comfort and improve efficiency of your heating system. To benefit from tado Smart Radiator Thermostats, you must also install a tado Starter Kit. Easy to install This product can be easily self-installed - simply unscrew your existing thermostatic radiator valve, replace this with a tado Smart Radiator Thermostat (using one of the 6 adaptors provided if required), and add the device in your tado app. The new universal radiator thermostat can be mounted both vertically and horizontally, depending on the type of radiator: the display switches automatically according to its position. Easy to useThe highly-rated tado app enables you to individually schedule and control each Smart Radiator Thermostat from anywhere, as well as providing insights and reports about the climate of individual rooms and showing you the energy savings made by tado . In addition, to control via the app, your target temperature can be changed on the device, plus tado is also compatible with Amazon Alexa, Apple HomeKit and Google Assistant, meaning you can control each Smart Radiator Thermostat using your voice, as well as integrating them into routines with your other smart home devices.In the box:4× tado° Smart Radiator Thermostat4× 2 AA batteries4× set of adaptorsVideo.iframe-container {overflow: hidden;padding-top: 56.25%;position: relative;}.iframe-container iframe,.iframe-container video {border: 0;height: 100%;left: 0;position: absolute;top: 0;width: 100%;}