The assembly is very easy. Connect the battery, unscrew device on the ceiling, finished. To change the battery you have to later open only the lid and connect the new battery. The device remains fully on the ceiling.
The test function is also very good. Man holding the button pressed until the alarm sounds, lets go, and the alarm will stop again. The cheaper versions you must first remove the battery, which is completely useless in my opinion, because after inserting a new battery you should try again ...
The unit will flash about every 40 seconds on red, but very weak. The device is so quite well bedroom Tough. It is in absolute darkness was only a slight shimmer, and even if one stares directly.
The sound is really loud and brash, you will be able to hardly hear. At best, the neighbor is just directly monitored :-)
The beiligende manual is very detailed and contains the assembly instructions also some general remarks on fire.
Absolute buy recommendation!
