A sensor assembly is described for driver assistance systems in motor vehicles, having a radar sensor and a video camera, in which the radar sensor and the video camera are integrated into a common housing. The PPG sensor includes a periodic light source, a photo detector, and circuitry determining a user’s heart rate from an output of the photo detector. The interlocking safety restraint mechanism is configured to automatically release the buckle tongue upon insertion of the anchor tongue and is further configured to automatically release the anchor tongue upon insertion of the buckle tongue. The apparatus additionally includes an insulating shroud that lines an interior of the chamber, the insulating shroud being configured to be electrically floating during the processing. Accordingly, two application programs can be linked in a mobile phone unit or other terminal devices, and problems when executing one application with regional properties under control of the other application can be resolved. or higher in an inert gas stream for reaction.