
Instead it says, "Welcome to Nest Protect History. But, although I've tested the Protect over several days, no history has ever populated in the app. From the main screen you can initiate a safety check whenever you like to ensure that the alarms are working (you can also do this by pressing the center button on the Protect twice, as I mentioned earlier) and, supposedly, review your history. Navigating the Nest app is pretty straightforward, but it has some quirks. That check consists of pressing the center button on the Protect twice to ensure that it's connected to the network and functioning properly. The screenshots above illustrate the basic setup process - remove the tab from the battery compartment, add your Wi-Fi information, opt in or out of the Pathlight/nightlight feature and you're basically done, aside from a prompt at the end for a quick safety check.
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As always, consult a professional if you have any installation questions or concerns. For the initial setup, it took me about 10 minutes from start to finish. Installing the hard-wired version yourself (also $99), will also require a basic comfort level with home electrical systems. I opted for a battery-powered model so I could test it in different locations it comes with six Energizer Ultimate Lithium (L91) AA batteries. Given that the Protect has to be installed near your ceiling, it might take you a little longer than a typical plug-and-play smart-home device.

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Since I already had the Nest app, I simply opened the app, selected "Add product" and followed the simple steps to start testing out the full functionality of the unit.
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I used an iPhone 6 Plus to set up my Nest Protect.
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With Wi-Fi, you can do a lot more, including naming your Nest Protect(s) hallway/basement/bedroom, etc., opting out of the Pathlight feature, receiving alerts and auto-updates to software, using the Nest Android or iOS mobile apps and Web app, pairing your Protect with the Nest Learning Thermostat, Nest Cam and select Dropcam models for advanced integrations and even accessing IFTTT for third-party automations with color-changing bulbs like those from Lifx and Philips Hue. This new sensor claims to be better at detecting both slow- and fast-burning fires, which, unfortunately, wasn't something that we could test directly.

Nest also upgraded its smoke sensor with a split-spectrum sensor that's exclusive to the Protect 2.0. To allow for of all of this functionality, the Protect has built-in sensors to detect electrochemical CO, heat, humidity, occupancy and ambient light, as well as a microphone. The Protect will also test itself for low batteries or any other concerns regularly, communicate with any other Protects in the house (if one Protect alarm detects smoke, all of the Protects in the house sound) and display a faint white light when you walk underneath it in the dark - presumably on your way to get a late night snack, a feature it calls Pathlight. There's smoke/CO.") And, if there's an emergency, it will flash red and say, "Emergency, smoke/CO detected." Whether or not you have Wi-Fi, the Protect unit will issue a loud warning if it senses increasing smoke or CO levels (specifically, it will flash yellow/orange and say, "Heads up. You can use the second-gen Nest Protect even if you don't have Wi-Fi (or temporarily lose your Wi-Fi connection for some reason). If you already have a first-gen Nest Protect, I'd skip this upgrade, but I strongly recommend the Protect 2.0 to first-time connected detector shoppers. With a slimmer profile, a new in-app "silence" button that allows you to turn off smoke and CO alarms remotely (the original Nest Protect doesn't currently support this feature) and integration with the Nest Learning Thermostat, Nest Cam and IFTTT, this $99/£89 detector is the best connected one we've seen yet.


Now, a second-generation Protect has arrived and it's noticeably sleeker and smarter than its predecessor. Its 'Wave' feature that literally let you turn off alarms with a gesture was deemed dangerously unreliable after it hit retail, leading to a recall. Its ability to transform boring, utilitarian household products into smart devices beautiful enough to make a design giant like Yves Behar weep (I imagine) is an incredible feat.Īnd yet, Nest's original Protect smoke and carbon monoxide (CO) detector had a big problem.
