I bought 3 of these alarms for my familys house. Only 1 functions as it is supposed to.2 of these detectors give off frequent false alarms. I had to take them down because they kept going off for absolutely no reason (all too often while my family and I were asleep!). This is not due to any error on my part. No remote control issues, no dirty sensors, etc. I carefully read the manual and looked at posts on this site and others made by users of this item to attempt to troubleshoot the false alarms. No solutions worked.As someone who works in the field of quality control, I find a 2 out of 3 unit failure is extremely pitiful and for a company that manufactures products that people depend on for their personal safety, well, that's absolutely disgusting. I'd give this item 0 stars if I could.