On request, the clock section of the LCD thermometer / clock S article number 801101 can be extended by the DCF module to automatic radio control (long-wave transmitter Mainflingen near Frankfurt/M). The DCF module can be mounted in the upper part of the vehicle for good reception and provides a range of approximately 1000 km around the transmitter location. It is ready to plug in and is supplied with power from the clock. Without a DCF module, or in case of poor reception, the clock continues to work in its usual quartz-controlled accuracy in order to synchronize itself to the time signal transmitter again at any time under better reception conditions.