RNP-01 and RNP-02 flush-mounted radio transmitters enable the execution of device control functions within the EXTA FREE system using devices mounted in flush-mounted boxes - under the existing accessories (light or bell buttons). This solution brings benefits in the form of easy installation of the EXTA FREE system, without the need to interfere with the existing electrical installation. Another advantage is the possibility of using electrical installation equipment from any manufacturer, which does not limit the design and character of the interior.