You need to make sure to get photo electric verses ionization type detectors. You also need to make sure all of your detectors are the same brand. They have to work together as a team. If they are different, you will have problems.
As a retired firefighter and alarm technician, I can attest to this. Also, if your house has is all electric, there is no need for CO detectors, so don't waste your money on these.
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