Fibaro Extra Temperature Sensor FGBRS-001 Smart Sensor White

The device can be used with an additional, dedicated temperature sensor (FGBRS-001) to provide the best temperature regulation.
It can be placed anywhere in the room and the device will use it as a reference point for the room temperature.
Before using, the sensor must be paired with the thermostatic head. One thermostatic head can be paired with only one sensor, but one sensor can be paired with up to three thermostatic heads.