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As with many articles I have again researched forever and ultimately ordered these smoke detectors.
- You should think of the batteries a long time ago (here up to 12 years)
- Do not blink
- You should not easily go / do not produce false alarms
- It should be heard in case of alarm throughout the house (what the hell is actually a non-crosslinked smoke detector in the bedroom for a sense if it in the kitchen free on the ground floor is a fire, but the legislator before it so?)

The 3 Pyrexx can be installed easily, cling magnetpaltten that stick again with very strong adhesive pads on my blanket (Even on Roll Putz!). But Screws / dowels are also included.
Safety pin out, press, Probeton (seehr loud), finished. In a simple candle they not yet walked on. A smoke test I'll still make. By the way they look very good and can be in the event of an alarm by pressing the bottom just turn off.

Addendum: Last week was middle of the night of the detector in the bedroom of our Sohnemann going - without reason. For the alarm but also heard by itself again, before we had gepeilt, what's going on. Well, at least we now know that you can hear it through the walls. But please, please not again such a false alarm ... that's what I wanted to avoid it and have spent more money !!!