With this Tado Radiator Thermostat 3-Pack, you'll have a complete set to control the temperature in 3 separate rooms. You can install the app on your smartphone and tablet, and adjust the temperature per radiator. You do need a bridge, because you can't control the radiator thermostat via the app without a bridge. This allows you to set the right temperature for each room separately. That's useful for the bathroom, for example. Because the radiator thermostats and your smartphone or tablet are connected all the time, the temperature automatically goes down when you leave the house. This means you never have to think about turning off the heating again.
The smart radiator thermostat from Tado doesn't work with all brands of radiator valves. Check in advance which brand of thermostat knob you have now. The radiator knob from Tado is suitable for valves from Caleffi, Comap, Danfoss, Giacomini, Herz, Olymp, Siemens, and Terrier.
For a wired connection, connect the thermostat to the wires of your current thermostat. Are you using the thermostat wirelessly? In that case, you'll need the extension kit to fully connect the thermostat. This isn't included by default.