In response to
Vicjmos's
comment from Jan 3, 2009:
I installed three of these in my house (one on each floor) in early 2008 to replace older wired smoke detectors that only had one sensing mechanism and did not have a battery backup. I have actually not had any issues with these units what so ever thus far. I re-read my review before replying to you and feel that my review still includes all of my relevant comments. Hopefully you have found them helpful. Take care and best of luck!