Our testers determined that Nest Protect was by far the easiest to set up, mount and connect because of its intuitive design and clear instructions. It took just a few minutes from opening the package to having a fully functional smoke detector ready to go. After you connect this Wi Fi smoke alarm to the internet, you can control, monitor and test the device remotely though a useful mobile app. The app also tracks battery life and allows the unit to test itself on a monthly basis. At night, the Nest Protect can detect movement and light levels nearby, allowing it to turn on a nightlight when you get up to visit the bathroom. As required by law, the sensors in the Nest Protect smoke alarm have a life expectancy of 10 years, so you won’t have to worry about replacing it for a decade. Unfortunately, the device warranty is only two years, unlike the 10 year warranties of the First Alert Onelink and Kidde KN COSM B RF. The Nest Protect smoke alarm is part of the company’s wider smart home strategy, which also includes thermostats, security cameras, security systems and video doorbells. You can also integrate third party devices like fans, sprinklers, lights, locks and more. They all can be controlled through the Nest app. The Nest app isn't the only way to integrate the Nest Protect in a unified smart home, the smart smoke alarm also works with popular third party platforms such as Nexia, Vera and Wink.