The smoke detectors were delivered quickly and reliably, batteries are included. I have attached the pieces with double-sided tape (assembly line) on the ceiling, was very simple and you do not drill. The function can be tested by a button on the smoke detector and the batteries should hold for 5 Years according to instructions. Perfect. Last weekend moved the Angrillen some smoke in the apartment from the balcony and the smoke detectors in the living room is immediately gone off, even though it is about 6-7 meters from the grill, the parts work great. Can only recommend this.
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