It's also available in a two pack as the First
Alert SA511CN2 3ST Est. $70, and that's the version that actually gets the most feedback. For example, at Amazon it earns a score of 4. 1 stars following more than 320 reviews. Wirecutter does not test the smoke alarm, and hence its evaluation isn't relied on in making our selection. That said, based on their own research, Doug Mahoney
calls the SA511CN2 3ST the best basic smoke alarm. The feedback on the SA511B is even better, albeit more limited: 4. 7 stars at Amazon, 4. 6 stars at Home Depot, but that's only based on around 20 reviews across the two sites. The First Alert SA521CN 3ST Est. $40 is a hardwired version of the battery operated First Alert SA511CN2 3ST/SA511B interconnectable smoke detector.
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A “self contained” panel is a single unit that mounts near the door.
In general, the other products were all very easy to use, though RemoBell had fewer options for motion detection, smart home compatibility and was the only video doorbell we tested that must be rung to show live video.
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