If you're just setting up Core for the first time, or if you instructed the app to "forget" your Core device, you'll need to pair your phone with your Core before you can use it. Once you've paired, the app will remember your device in the future, and will automatically try to reconnect with it every time you use it.
If you're having trouble with this process because the app can't seem to locate your Core device, here are some things you can try.
Ensure you have a clear signal between your phone and the Core.
Your Core should be close by your phone, with nothing in between them that could potentially block communication. Make sure that Bluetooth is enabled on your phone.
If you have more than one Core, try moving away from the others to ensure it isn't attempting to pair with the wrong one.
If more than one person in your household has been using this Core, make sure they aren't already paired with it! They'll need to "Forget Device" (via the "Profile" tab of the app) before you can pair with it yourself.
When the app is trying to pair, and it successfully locates your device, you should see the lights on the top of the Core cycle briefly. You can then pick up Core and hold your thumbs on top for a few seconds to complete the pairing process.
"Wake up" your Core, and make sure the battery has charge.
If it’s been sitting dormant for a while, your Core might be in low-power mode. You can “wake it up” by holding it and briefly placing both your thumbs on the metal dots on top.
Two lights should appear between your thumbs when you do this. Once you see the lights, tap "Try Again" to retry the pairing process, or "Continue Searching" to retry the reconnection process.
If no lights appear when you hold it, your Core's battery may need charging before it can be paired to your phone.
Check the battery level and charge your Core.
To charge it, place Core in its base, ensuring the metal pins in the bottom line up with the pins in the base. You’ll feel the Core fit snugly into the cradle when the pins are aligned correctly.
When Core is placed correctly in its base, it will light up. The number of lights on top indicate how much charge it has — if you see a complete circle of lights, it's fully charged. If you see only one or two lights, you'll need to let it sit for at least a few minutes before you try to use it.
If your Core is very low on battery, you might not see any lights at all. In this case, let it charge for a few minutes first, then pick it up and place it back on the base to check the battery level again.
Check the charging cable.
If you've left it in its base for at least 5 minutes, and it doesn't seem like Core is charging, make sure the charging cable is firmly inserted into the base of the cradle.
You can also try swapping the cable out for a different one. Core uses a standard micro-USB cable, which is common for a lot of small electronic devices.
Manually reset your Core.
Once you've verified that your Core's battery is charged, but the app still can't locate it, you can try manually resetting the device. On the bottom of the Core is a small round button. Press it firmly and hold it in for about 7 seconds.
You'll see the lights on top of Core cycle once the manual reset is complete. If you hold the button for at least 7 seconds and don't see the lights come on, your Core's battery may not be charged (see above for information on charging.)
Note: Avoid having your hands on the metal dots as you hold the button, otherwise your Core will go into a special reboot mode.
Restart the app.
If none of these steps is helping, you can try quitting the Core app itself, then re-launching it and trying again.
Always make sure that you're using the latest version of the Core app. The best way to stay updated is by making sure that "automatic updates" are enabled on your phone, or you can manually update to the latest version by visiting the app store.