I had the same problem with my CO detector. I found the model number of the existing unit, went to ACE hardware, and bought the replacement model. (could have ordered from Amazon but it was quick and easy to get from ACE). When I looked at the existing unit on the wall, I saw that the backing plate had wires attached to contacts. So all I had to do was to unsnap the front part of the detector from the backing plate. Then inserted the front part of the newly purchased detector to the old backing plate. The contacts on the old backing plate matched the contacts on the new detector. So no wiring was required. If you are comfortable climbing a ladder, the fix to replace one of those alarms was not as difficult as it might seem. Needless to say, I was sure relieved that it turned out to be relatively easy.
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