We have our rooms equipped with fire alarms or smoke these. Installation is very easy with the supplied screws and plugs. It stood at 2 per detector Battarien what the price again improved. The function seems to be good because the detector in the kitchen has triggered good already at a ser strong fry. At the detector a small red LED flashes, but not bothersome welce is (you have to look closely to see it) even in dark room.
