This Tado Smart Radiator Thermostat 6-pack (expansion) includes 6 smart radiator knobs that allow you to control radiators individually. You can install the app on your smartphone and tablet, and adjust the temperature per radiator. You do need a Tado bridge for this, otherwise you can't control the radiator thermostat via the app. This allows you to set the right temperature for each room separately. That's useful for the bathroom, for example. Since the radiator thermostats are connected to your smartphone, the temperature automatically goes down when you leave the house. That 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 wireless pack.