What can you say to a fire alarm: it depends on the ceiling and flashes now and then to red. In fact, the lightning is not disturbing, although as that found in the bedroom no other light source. The distances are large enough that you can see and follow no rhythm - without falling asleep but :-) What bothers me: On the basis of substructure I have aligned the detector just in space. If, now the fire alarm on the bolted bracket, sits the front awry. Toll. But the troubles. Of course, the function restricts the not one, but if you already attaches an exact template, then you could but also align the substructure decent.