1.HDMI and VGA port can't be used simultaneously.
2.Only HDMI port could transmit audio and video, VGA interface could only transfer video.
3.For Apple devices released before April 2010 do not support audio out and will not transmit sound from Mini DisplayPort.
4.Mini Displayport is compatible with Thunderbolt(1st Gen) and Thunderbolt 2, NOT compatible with Thunderbolt 3.
Product Description:
Brand new and high quality
Function: Cast Mini DP Macbook or Laptop to a larger screen of HDMI or VGA TV/ Monitor or Projector, so that you can enjoy on a larger screen with better hearing and visual effects
To HDMI Port, support up to 4Kx2K , to VGA port, support up to 1080P
Plug and Play, no need extra power supply, very easy to use
High compability