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Like the KN COSM BA, it has a voice alert to announce whether the hazard is smoke or carbon monoxide, but that and location information is not passed to other alarms in the system. It has been professionally reviewed by Consumer Reports as both a CO detector and a smoke detector, but with only middling ratings. Users are pretty pleased, however, though some complain of false alarms or of receiving the wrong/different unit compared to the model listed and pictured. At Amazon, it earns a 4. 4 star rating following more than 485 reviews. As is the case with smoke detectors, some states and cities require combination smoke and CO detectors to use a non replaceable battery with a 10 year lifespan.security systems for home reviews
It's very similar to the First Alert SA320CN save for the power source a sealed 10 year lithium battery that complies with regulations in those areas that require them. It's not been professionally reviewed, but the handful of user reviews we spotted scattered on sites across the internet have largely been positive thus far. For example, though the totals are lumped in with the First Alert SA320CN at Amazon, all but 4 of the more than 30 that weigh in on the SA3210 specifically grant it either 4 stars or 5. Among combination smoke and carbon monoxide alarms, the First Alert SCO501CN 3ST Est. $50 looks like a top choice. Like the First Alert SA511CN2 3ST discussed in the section on photoelectric smoke alarms, the SCO501CN 3ST uses radio technology to set up a wireless network with other First Alert interconnectable alarms smoke, CO or combination without the complications that a hardwired interconnected alarm system would entail, though you might need to experiment a little with alarm location to make sure that each unit is within range of at least one other interconnected alarm.