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![communication - How does this fire alarm system transmit data on two-wire? - Electrical Engineering Stack Exchange communication - How does this fire alarm system transmit data on two-wire? - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/eB9NP.png)
communication - How does this fire alarm system transmit data on two-wire? - Electrical Engineering Stack Exchange
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First Alert SA511CN2-3ST Wireless Interconnected Smoke Alarm with Voice Location, Battery Operated, Pack of 2 , WHITE - Smoke Detectors - Amazon.com
![First Alert SA511CN2-3ST Wireless Interconnected Smoke Alarm with Voice Location, Battery Operated, Pack of 2 , WHITE - Smoke Detectors - Amazon.com First Alert SA511CN2-3ST Wireless Interconnected Smoke Alarm with Voice Location, Battery Operated, Pack of 2 , WHITE - Smoke Detectors - Amazon.com](https://m.media-amazon.com/images/I/61uANJyz9YL.jpg)