Great idea bad implementation

The idea with the emergency I was so good that I decided for this detector.
Product unpacked. This led to the first disappointment. The detector makes a very Minderwertigverarbeiteten impression. Unfortunately, there is also an insect screen in front of the smoke chamber, so it can happen that a mosquito will trigger the detector.
This leads to the next disappointment, within 1 month I had 2 false alarms.
After the Second, the detector not wandered back to the ceiling special directly into the dustbin.
Too bad about the money. Better and more reliable detectors are available for less.