The adhesive magnet-mounting works great and it keeps perfectly. I stayed here 15 smoke detectors in 20 minutes applied to substrates of coated plaster to woodchip wallpaper, for months holds. Supplied everything is up to the battery included, so unpack, install, done. The function had been fortunately only be tested using the test button - the very loud beeps you hear really well in the big house everywhere. Because of the simplicity of installation and the complete scope of delivery I have the smoke detectors already bought later for another apartment.
