Elro Blueline smoke detectors comply with the German smoke detector legislation. If you place a Blueline smoke detector on each floor, you'll be warned for the initial stages of a fire anywhere in the house. Choose at least 1 smoke detector for each floor. For more safety, you can also put up a smoke detector in any room where electric devices are being charged and in all bedrooms. That way, you'll know as quickly as possible if there's a fire in your home.