Late-2016 MacBook Pro comes with a brand new start-up feature. When the notebook is powered off, it will automatically start up when you open the lids or connect to the power supply.
Specifically, when MacBook Pro is power off, it turns on when:
- Open the lid of your Mac, even if it’s not connected to power. This is provided the MacBook Pro isn’t completely out of power.
- Connect it to a power adapter while its lid is open.
- Connect it to a power adapter while its lid is closed and it’s connected to an external display.
Source: Apple Support Article