How to unlock your Mac with an Apple Watch – TechRadar

There’s no reason to type your Mac password or use Touch ID to open your computer. Instead, you can use your Apple Watch. The wearable device, when you’re nearby your computer, will automatically log you into your computer. Apple Watch can also be used to approve other password requests with the macOS Auto Unlock feature. 
Setting up Auto Unlock
Both your Mac and Apple Watch must support Auto Unlock to add the feature. With watchOS 3 or later installed, Auto Unlock works with all Apple Watch models….

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