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It's the most full featured alarm, blaring out a loud siren and telling you where the problem is. It works with a lot of other smart home systems, so for example it can turn on all your Philips Hue lights, making it easier to find your way out. However, if you don't want to spend more than $100 on a smoke detector—you should have several in your home—then check out the Roost Smart Battery. This 9 volt Wi Fi connected battery costs just $35, goes into any smoke detector, and alerts your phone when the alarm goes off. Make sure you check out all of our top picks for smart speakers, lights, locks, and more on our best smart home gadgets page. Latest News and Updates July 2019FirstAlert has launched the OneLink Secure, a mesh router that can link to its OneLink Safe and Sound smoke detector, and send out warning messages to devices on the network with screens such as smartphones, tablets, and TVs in the event of a smoke, fire, or carbon monoxide condition.