B) The remote setpoint – if the T-2 thermometer is additionally paired with the RTHreceiver, the AURATON 200 RTH regulator retains the capability of temperature setting, however its control is performed with the paired T-2 thermometer only. This feature allows for regulating the temperature in a room other than the one where the AURATON 200 RTH regulator is placed. An example you want the temperature in the “children’s room to be always at 22 C, however you do not want children to be able to change it - in that room, you install the T-2thermometer, and the AURATON 200 RTH regulator in e.g. the kitchen. This way the temperature in the “children’s room will always beat C regardless of temperature fluctuations in the kitchen.