The smoke detector and also supplied the batteries contained have a current production date. This is important because both have an expiration date, after which it should no longer be used. I had previously bought from the hardware store smoke detectors, which were equipped with conventional batteries. Unfortunately, I realized there that the smoke detectors were superimposed inclusive of contained batteries and partly did not work from the beginning.
The supplied magnet holder are very handy. The tape also keep on multiple überstrichenem ceiling plaster or coated woodchip very good. The strength of the magnets is more than sufficient.
