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Review title: Nothing but Trouble
Product review: Our state passed a law requiring CO detectors in all sleeping areas. Since my existing wired smoke detectors were nearing the end of their life, I thought I would just replace them all (7 units) with the SC9120B model. For the first year they worked fine. The next year after that I started seeing a unit falsely alarming a CO alarm. Replaced that unit under warranty and found that it only worked when it isn't connected to the other units. 9 months later, a different unit started to alarm on CO, falsely. Since I wasn't home at the time, the fire department had to locate the issue. The fire dept made a comment that these type of detectors are notorious for false CO alarms and recommended that I switch back to smoke alarms only and get a stand alone CO detector. The stand alone smoke alarms are good for 10 years whereas the combined smoke/CO detector are only good for 7 years before they will alarm for replacement.
