Property me because of positive reviews is 3 this smoke detector ordered. Delivery as usual very fast u. Neatly packaged. The smoke detector is compared to a detector installed for several years considerably smaller - only 10 cm in diameter. The backing plate was ruckzuck bolted to the wooden ceiling - battery inserted (MHD until 12/2017!) - With a small rotation mounted - ready! Just a pity that there are these things only in white - looks to 'its wooden ceiling just not as attractive ..... function test without any problems, alarm sound extremely loud and piercing -. You can hear through closed door one floor down. The approximately every 30 seconds flashing LED as function control is only faintly visible and only seen even in the dark, if you look closely in the direction of -. So absolutely bedrooms suitable. Especially at the price an absolute buy recommendation.
