tado° Quattro Pack /SRT-4 - four Smart Radiator Thermostats If you want the tado° Smart Kit to unfold its full potential for optimizing the living climate while saving heating costs, the Quattro Pack with four Smart Radiator Thermostats is the right solution. The intelligent temperature control can thus be extended to several living rooms. The Smart radiator thermostats can be installed on all standard radiators using the adapters supplied and replace conventional radiator thermostats. Via radio, the Smart Radiator Thermostats communicate with the separately available Extension Kit, which can further reduce energy consumption by accessing the main heating system, and with the Internet Bridge, which provides the Internet connection via router. With the tado° smartphone app, active or automated remote control of the individual room temperature is possible based on various information, such as the occupant location, the weather forecast, window opening, a schedule or individual room contr