Surface-mounted room sensor with radio for temperature measurement in living and office spaces. Energy-autonomous room control unit for integrated measurement of temperature and relative humidity (rH version) in living and office spaces. Also available with rotary switch for fan level adjustment, slide switch (e.g. 'day/night') or presence button. The device, which is mounted using an adhesive pad or screws, sends its values unidirectionally to corresponding receivers or gateways, which process the information directly or - depending on the application - forward it to a central control unit.