Summarize of Apple Watch unlocking Mac

The macOS Sierra was released on 9/20 this year. One of the most interesting feature, I think, is Apple Watch unlocking Mac. I tried the feature on 9/21, Chinese time. I'm summarizing it as below.

• Apple devices unlock model:
• Unlocked iPhone unlocks Apple Watch.
• Unlocked Apple Watch unlocks MacBook.

• Enable the unlocking feature in MacBook.
• Connect to Internet
• Setup Two-Factor Authentication via iCloud account (Apple ID).
• Specify the unlocked password for the MacBook that is different from iCloud account password.

• The unlock conditions:
• Apple Watch is unlocked.
• Direct Wi-Fi (It is not necessary to connect to Internet or to Wi-Fi station)and Bluetooth must be enabled. 
• Apple Watch is near to MacBook.
• Press any key on MacBook or open the cover to unlock it. 

-Count