About USB-C Dongles and Hubs I'm looking to get a USB-C Hub like the one in the image, there are several of those.



What I understand is that all of these hubs, no matter the brand, they take out 2 USB-C in exchange for 2 USB Type-C and several USB Type-A and SD Card slots, etc.

The little Lightning icon means that it is the port used to charge the MacBook... but my question is this:

Can the other USB-C (not the one with the lightning icon) be used to send video to an external display? Example: With a USB-C to DisplayPort cable (not 4K)
From the product description at Amazon for Lenovo USB C Hub, Aluminum Type C Hub Adapter for MacBook Pro 13" and 15" 2016/2017, Thunderbolt 3 Port, USB-C Port, SD and Micro SD/TF Card Reader and 2 USB 3.0 Ports, Grey it states:


  The Thunderbolt 3 USB-C port supports data transfer, video output, and charging while the standard USB-C port only supports data transfer and does not support USB-C video output or USB-C charging.


BTW The port with the lighting icon is the port referenced in what's quoted above.

Other mentioned product description/specifications include:


  
  Color:Grey
  This 6-in-1 Lenovo USB Type-C Hub expands your 2016/2017 MacBook Pro capabilities while on-the-go. 
  This adapter only applies to 2016/2017 MacBook Pro 13‘’and 15‘’. 
  Only one hub is included, power adapters, SD/TF memory cards, cables or other accessories are not included. 
  The Thunderbolt 3 USB-C port supports data transfer, video output, and charging while the standard USB-C port only supports data transfer
  and does not support USB-C video output or USB-C charging. 
  Compatible displays and cables are required to achieve maximum video resolution.
  One USB-A port supports a charging output of up to DC5V/900mAh and two USB-A ports support a total charging output of DC5V/1.5A. USB-A
  port is not recommended for charging.
  SD and TF card slots can be used simultaneously.
  Specifications:
  Brand: Lenovo
  Product Type:USB C Hub
  Model: C608
  Interface:USB 3.0 Type-A port，Thunderbolt 3 USB-C port，Standard USB-C port，SD/TF card slot
  Tips
  For best performance, devices connected to this hub should not exceed total current of 900mA maximum. Otherwise, output current may
  become unstable or disconnected.
  Below devices are often rated as follows for your reference:
  Mouse: 100mAPortable hard disk: Max. 500mA
  USB 3.0 portable hard disk: Max. 900mA
  Keyboard: Max. 500mA
  
  
  Please double check the current of your devices before connecting to
  the hub.