I bought the magnetic attachments for smoke detectors Ei650. The installation is very easy, so I was thrilled completely by this product after installation of the entire house. After only 3 months, however, the smoke detector falling gradually from the ceiling! A smoke detector is gone kaput. However, this is not related with the fact that I have glued the pads on woodchip! The adhesive of the pad remains after the crash on the ceiling and can not get down. What's coming off the pad from its own adhesive. Say: The Ceiling Magnet Pad cut yourself! I advise on this experience of this product and will make myself to look for a better alternative processed.