•  Thunderbolt 3 Port to Thunderbolt 2 Adapter for 2016 Macbook Pro Display MC914 and Hard Disk Case;Please note the adapter only can work for 2016 Macbook Pro Thunderbolt3 USB-C 40Gbps Port , Cannot work for the USB-C 5Gbps/10Gbps Macbook.
• The thunderbolt2 port can connect the Hard disk, Apple Displays.(it cannot connect the mini displayport device.it can not work for mini-DP mode);The Thunderbolt 3 to Thunderbolt 2 Adapter lets you connect Thunderbolt and Thunderbolt 2 devices  external hard drives and Thunderbolt displays.
•  for example — to any of the Thunderbolt 3 (USB-C) ports on your 2016 MacBook Pro As a bidirectional adapter, it can also connect new Thunderbolt 3 devices to a Mac with a Thunderbolt or Thunderbolt 2 port.
•  OS Requires : macOS Sierra.(window cannot work)
• Note : The adapter cannot connect any mini displayport device. 
• The adapter only work for new macbook pro with MACOS Sierra, cannot work for windows. 3.The adapter cannot work for 5Gbps/10Gbps USB-C port.
•  The adapter does NOT duplicate the functionality of the Thunderbolt ports on MacBook Airs and legacy MacBook Pros when daisy-chaining accessories together.5. The adapter can’t work for the PC with Type-C port.