81 and Kidde i4618AC $14. 12 These hardwired models detect smoke using an ionization sensor. Neither model detects carbon monoxide. Tips for Choosing a Smart Smoke DetectorAlertsIn addition to tone alarms, the best smoke detectors alert you with voice notifications that tell you what kind of danger they identified and where it’s located in your home. Look for smoke alarms that interconnect, which allows them to sound at the same time when one detects a problem so everyone in the house knows about the potential emergency. Carbon Monoxide SensorsCarbon monoxide is a deadly gas that's odorless and colorless, so having a detector in your home can save your life. Most of the smoke detectors we reviewed also monitor your home for dangerous levels of carbon monoxide in addition to smoke. Mobile AppEach of the smoke alarms we tested can connect to a mobile app, either through Wi Fi, Bluetooth or a smart home hub. The app helps the smart smoke detector track battery life and sends you notifications to replace the battery before it starts to chirp in the middle of the night. It also lets you monitor conditions in your home, hush false alarms and test your devices remotely. If something happens when you’re not home, you receive an alert on your smartphone.

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Number of digital outlets per household may be limited.

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