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First Alert SA511CN2-3ST Wireless Smoke Alarm

Post Updated June 6, 2026 by Perry Penn

The First Alert SA511CN2-3ST wireless smoke alarm is produced by one of the most trusted names in home safety products. It comes with voice location features, placing it on a short list of the most modern and technologically advanced domestic smoke alarms on the market today. It comes with an 85 dB siren that is very easy to hear, even from some distance and even while asleep. It also features a voice alarm, which is designed to tell you the location of the danger.

First Alert SMI100 Smoke Alarm, Battery-Operated Detector with Test & Silence Button

First Alert SMI100 Smoke Alarm, Battery-Operated Detector with Test & Silence Button

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The SA511CN2-3ST uses photoelectric sensors. This means that it can detect visible smoke particles, which are associated with smoldering fires. It is advisable to also install an ionization sensor smoke alarm, which detects invisible particles associated with flaming fires. Meanwhile, the SA511CN2-3ST is also designed to prevent false alarms and it won’t sound as a result of shower steam or cooking.

Uniquely, the product comes in a pack of two, and the two smoke alarms are interconnected. This means that the two devices, installed in two different locations in the home, work together. When one alarm sounds, the other alarm will automatically be triggered.

This ensures that you and your loved ones will be warned as early as possible. The two devices effectively talk to each other, and also to you. And since the device is battery operated; it will keep working in case of a power outage, and it can be installed anywhere.

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