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Alternatively, in some implementations, the electrical connector 722 is coupled to one or more electrical wires for receiving a power supply or exchanging data with another electronic device.

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The North American market can be termed as the most competitive market due to high product reach, increasing market demand, and the presence of several players.

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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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