Good idea, poor implementation. Yesterday again: 4 of 5 Window receive incorrect information. New Setting - lasts forever. 2 weeks before the server crash at the weekend: Conclusion: batteries empty because of constantly connect is sought. Again and again the empty promises Hotline. Nothing happens. 500 for 'scrap' and the 'inventor' of the DECT technology. Shame On You. (That in accordance with the pushy 'Duzen' Hotline)