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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. Not only can you network multiple Nest Protect units together, but you can also connect other Nest devices such as thermostats and security cameras. Additionally, the Nest Protect is compatible with other smart home networks including Nexia, Vera, Wink and Google Home; it doesn't work with Amazon Alexa or Apple HomeKit. Unfortunately, the two year warranty is shorter than those from First Alert and Kidde. Read the full reviewBest ValueKidde KN COSM B RF$49.