Radio sensors for the typical level of contamination found in residential, office, and hotel spaces. Primarily used in renovation projects or when expanding heating systems. Wireless room temperature sensor for measuring and adjusting room temperature. When used with alre wireless actuators and the b@home gateway, it enables individual room temperature control. The sensor can also be connected directly to the actuators without the b@home gateway to achieve individual room control and trigger a temperature reduction of 4K with the switch. A necessary battery replacement will be indicated by the sensor shortly.