Smoke detectors in convincing quality

Material, processing, packaging and documentation / instructions make me a convincing impression. The instructions are in German, kept short, but well-structured and easy to understand. The packaging is appropriate and meaningful labels. Assembly with the magnetic adhesive pad is easy. Activation and test alarm completely unkomliziert. The cover underside can be removed and fitted again. The plastic case is carefully finished and makes a high quality impression.
Big plus: No flashing LED in or on the detector that could go on my nerves at night.
Weight without adhesive pad determined with my kitchen scale: 135 g
Diameter 10.5 cm / height 4 cm -> significantly smaller than a similar product of another European manufacturer.

Some customers here are upset because the battery is not replaceable. Now, after 10 to 12 years, the appearance is probably dirty and the electronics are unreliable due to aging processes. When customers change the battery is not guaranteed that a correct replacement battery is used and it is installed and contacted errors. An error-free operation would no longer be guaranteed. For reasons stated above, I think it is important and right that the detector is completely replaced after 12 years.

As for the durability and false alarms, I can now, of course, prefer not to say. If false alarms or fail completely the detector, I will add it here. (At least as far Amazon has this possibility by then not to come off its dealers and suppliers against)

Overall, a strong buy recommendation from me. The slightly higher price is certainly justified, because the detector is produced in Germany and is not comparable with Chinese cheap junk.