We have deliberately taken the form nicer little smoke detectors from a German manufacturer, to receive quality goods in the hope. Ultimately, we were disappointed - although the look is a bit nicer than comparable models (mumbi, ...), it is nevertheless that the functionality is unfortunately no better despite significantly higher price. Just a few days after application there was already the first false alarm. Of course, in the middle of the night and after all those present were awake, heard the alarm automatically on again. Very annoying, especially since it is a rented cottage and guests are all the more sensitive if something does not work smoothly.