Tado Smart Radiator Thermostat This is a programmable thermostat that offers 7-day programming. It is compatible with Tado° brand systems and operates on battery power with wireless wire configuration. The thermostat is made of heat-resistant plastic material and includes batteries in the package. Control is via the Tado app and Wi-Fi smart home protocol. This thermostat provides automatic system switching for frost protection and heat stage control. It is a reliable and efficient option for central heating radiator systems. * bought in a box of 4 and not required so is brand new*