I had ordered four detectors nine months ago and let two of them installed by an electrician (the other two were for another apartment, completely restored to be I'm just, thought). At the very first broke the front metal plate, which is not too bad actually but it detectors did not react - to say he has not switched off the light. We thought that is related to the metal plate together and built the next. Two detectors then worked the last nine months perfectly. Now A few days ago one of the two detectors began the light no reason in 30-sec intervals independently and to turn off. Since I still had a new, unused left, I had to exchange these detectors. With the result that this - like the first - the light does not turn off again. Conclusion: Amazon has delivered as always fast and the withdrawal of the product by Amazon is running smoothly. For the quality of products Amazon mE can not. I would no longer buy these detectors and would not have been satisfied with an exchange for new part of Amazon. I admit (for now) three detectors back - thanks Amazon Works problem-free - and wait until the fourth fails.
