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 !!!