11ac OneLink Secure Connect base station is $149, and should cover up to 2,500 square feet. A bundle with the base station and two satellites costs $329. It's not a smoke detector, but the Airthings Wave Plus $269 can detect Radon, CO2, TVOCs, humidity, temperature and air pressure. It connects to your phone via Bluetooth, so you'll have to be within range if you want to receive alerts. 99 View at eBay$115. 99View at Newegg Business$127. 65View at Amazon?Voice alarm tells you where danger is and how to proceedMobile app connects smoke detectors, thermostats and security camerasConnects to a variety of smart home networksHas a relatively short warranty period of two yearsIsn’t compatible with Amazon AlexaIsn’t compatible with Apple HomeKitIn addition to the standard tone alarm, the Next Protect features a voice alarm that calmly tells you about the danger, where it is and how to proceed. If you happen to be away when an emergency occurs, this smoke alarm’s mobile app notifies you immediately. This allows you to contact emergency services and potentially avoid the worst of the damage. The app also lets you monitor what’s happening in your home and test alarms remotely, and it teaches you how to best use your smoke detector. This smoke alarm is only one piece of Nest’s larger home automation system.

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You can also add an outdoor camera, 24/7 continuous recording, and environmental sensors for smoke, flood, and carbon monoxide.

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