Google’s Smart Lock feature for Chromebooks lets you unlock your notebook automatically when your smartphone is nearby.
You’ll need a phone running Android 5.0, a Chromebook running Chrome OS version 40 or later, and support for Bluetooth on both devices.
Smart Lock will let you log into your Chromebook without entering a password, saving a bit of time. Since this only works when your phone is near your laptop, it should prevent unauthorized users from accessing you data.
In order to sign into your Chromebook, your Android phone will need to be within Bluetooth range (about 100 feet) and you’ll need to unlock the lock screen on your phone.