The smoke detector is supplied with the German instructions, a battery, and the matching screws + dowels. Insert 9 V battery, drill two holes in the ceiling, wall plugs in, plastic holder, tighten these to the ceiling with the screws that hold smoke alarms off, turn 1x, finished. The red light flashes every 32 seconds discreetly under the plastic. False alarm did not exist for me and if it did occur, is determined not on the detector, but to batteries that are good for nothing. When in doubt, just a brand to give preference. High makes the smoke detector a solid impression and is also relatively inexpensive.
Duracell Plus Power 9V battery (MN1604 / 6LF22) 2er
