If you're installing more than one Nest Protect, you should set them all up and them to your Nest Account before installing them.

Put all your Nest Protects on a table so you easy access to them all.

Don't pull out the battery tab yet. The Nest app will tell you when to. If you already have, don't worry.

If you don't have a Nest Account already, go to the the Apple App Store or Google Play to download the free Nest app. Then create an account with the app. All you need is a valid email address. You'll have to validate your email address before the account can be used.

Nest Account frequently asked questions >

If you already have the Nest app, make sure that it's the most recent version.

• On an iOS device, select the Updates option from the App Store app.
• On an Android device, open the Google Play app and search for the Nest app to update it if needed.

Sometimes iOS or Android devices won't immediately connect to Nest Protect over Wi-Fi and will automatically switch to cellular. This can cause a setup error.

You should manually disable cellular data before you set up your Nest Protect. Once you're done with setup, you can re-enable it.

For iOS devices, go to Settings > Cellular and turn off the Cellular Data switch at the top of the screen.

Note: If your device is running a custom version of the Android OS, your menus may be different. For instance, on the Samsung Galaxy Note 3 and Galaxy S4, you'll need to go to Wi-Fi Settings> Advanced and uncheck Auto network switch.

Automatic network switching options should be also disabled or your Android device may not be able to connect to your Nest Protect.

Go to Wi-Fi settings and select Advanced from the menu. Again, your Android device's settings menus may be different.

You may need to power down and restart your Android device for these changes to take effect. After restart, double-check that Wi-Fi is enabled.

Open the Nest app and sign into your Nest Account.

The Nest app will turn on your phone or tablet's camera. Use it to scan the QR code on the back of your Nest Protect.

The Nest app will automatically recognize it.

My phone's camera won't scan the QR code, what should I do? >

Pull out the blue tab on your Nest Protect. It will greet you and the light will begin to glow blue.

If you've already pulled the tab out, but the light isn't glowing blue, press the button on your Nest Protect to wake it up.

Now you'll let your Nest Protect know where it's going to live. Pick a room.

Nest Protect will speak the room name you've chosen during a Heads-Up alert or Emergency Alarm.

You also have the option to add a label or create a custom name.

Learn more about Nest Protect locations, names and labels >

If you have a Nest Protect already added to your Nest account, the app will ask you to press its button so it can connect to your new Nest Protect.

They'll need to be in range of each other to connect. So if your "already added" Nest Protect has been installed in another room, take your new Nest Protect (and phone or tablet) with you.

If your Nest Protect's light isn't spinning blue already, press the button to wake it up. Then it will connect to your new Nest Protect and transfer your Wi-Fi network information.

Your Nest Protect will now create its own ad hoc Wi-Fi network to complete setup. This temporary network lets you connect your mobile device to your Nest Protect so you can tell it your home's Wi-Fi network name and password.

If you're using an Android device, the Nest app will automatically connect you to the ad hoc Wi-Fi network.

Note: If your Nest Protects have connected to each other, you may be able to skip some of the following steps that ask you to enter your Wi-Fi information. Don't worry, the app will tell you exactly what you need to do.

If you're using an iOS device, you'll need to switch Wi-Fi networks manually. Follow these simple steps:

1. Take note of the name of the Nest Protect's wireless network. It should begin with "NEST."
2. Press the Home button to switch out of the Nest app. Open the iOS Settings app and select Wi-Fi.

You will see a checkmark next to the Nest ad hoc network when you have connected to it.

Note: If you don't see the ad hoc network, press the Nest button on the Nest Protect again, when you see the light ring glow blue the network should appear in your device's Wi-Fi list. You can also switch your iPhone's Wi-Fi off then on again to force refreshing the list of available networks.

Note: After joining the ad hoc network, you will not see a Wi-Fi icon in the top left of the screen. You will only see a 4G or 3G icon until pairing is fully completed.

Tap to select your home Wi-Fi network.

Important note: If your Wi-Fi network isn't appearing in the list of available networks, here are some troubleshooting tips. If you have hidden your network for security purposes, read the article below:

Learn how to connect to a hidden Wi-Fi network >

Next, select the Wi-Fi network you want your Nest Protect to connect to and enter the password. If you don't see your network, it may be hidden.

If your Nest Protect cannot connect please see the following article for help:

Troubleshooting Nest Protect's Wi-Fi connection >

Note: If Nest Protect can't connect to your Wi-Fi network, double check that you have entered the correct Wi-Fi password.

The Nest app will then ask if you have more Nest Protects. If you do, it'll take you through a faster setup for the rest of them.

See the article below for installation instructions:

How do I install Nest Protect? >

Install the Nest app and create an account

Change your iOS or Android device's cellular settings

For devices running Android 4 and higher: go to Apps > Settings > Mobile Networks > More and uncheck Data enabled to turn off mobile data.

Check Wi-Fi settings on your Android device

Uncheck Avoid poor connections.You can re-enable it after Nest Protect setup is complete.

Add Nest Protect to your account

If this is your first Nest product, choose Add New.

If you already have a Nest product in your account, select the Settings menu in the top right corner. The icon is shaped like a gear.

Select add product...

...then tap Nest Protect.

Scan the QR code

The Nest app will guide you through setup. Make sure you have your Wi-Fi password and a screwdriver handy for installation.

Pull out the tab

Tell your Nest Protect where you're going to install it

Connect to another Nest Protect, if you have one

Connect to Nest Protect's Wi-Fi network

Select the network if you're using an iOS device

Select the Nest Protect's ad hoc network from the list of available networks in Wi-Fi settings. It may take up to a minute before the ad hoc network appear in the list of the Wi-Fi networks.

Switch back to the Nest app. Your phone or tablet will now connect to Nest Protect. It may take a minute or two

Connect Protect to Wi-Fi and the Internet

Enter your Wi-Fi network password and press Join.

Your Nest Protect will now join your home's Wi-Fi network.

Now you'll choose Pathlight settings so Nest Protect can light your way in the dark.

Nest Protect will now connect to the Internet and be added your Nest Account. It will tell you when it's finished, and you'll see its light turn from blue to green.

Like all smoke alarms, Nest Protect works best when it's dust free. Use the plastic cover or the box that it came in to keep dust out until you're ready to install.