The smoke comes well packed with detailed instructions for installation and operation. The installation is very simple: attach the base plate to the ceiling with two screws, unscrew smoke detectors, finished. Turning up the smoke detector on the base plate, the integrated battery is activated. In operation, the smoke detector is quiet, no noise, no flashing an LED (particularly in the bedroom).
I bought and installed this 6 smoke detector. All properly. Smoke detector assembly per about 10 minutes. So far, not a single false alarm. I am very pleased.
