Elro Cavius by Elro Mini-Design 10-year smoke alarms / smoke detectors tested to DIN EN 14604 with fixed battery, 2002-023 (tool)
Granted, smoke detectors are useful and can save lives, but I've myself thinking such a thing on the ceiling to have, but, visually seen a little hard done. So we scoured the great selection of smoke detectors in the local market and then eventually