The nice thing about the smoke alarms in my opinion is their appearance. They are actually "pure white" and have no off-white shade, how many other devices. They also tend to be smaller than other smoke detectors in proportion. The mounting with two screws is absolutely easy. A red LED that flashes from time to time, provides information on the operational readiness of the smoke detector. The flashing is in my opinion very discreet and anything but irritating.
I think with a unit from ABUS one decides for quality - and would issue a strong buy recommendation for this smoke detector.