Rear monitor SM-14
 
14"external monitor
Type C, Mini HDMI 
If connection with type C 3.2, can control headunit vice versa.
If connection with HDMI (mini) , displays 2x HDMI output  with use of HDMI splitter convertor.
 
Tested with One Type C , with two HDMI out with splitter. Total 3 monitors.
 
Headunit needs to have Type C output in order to control via rear monitor. Full control on apps, full touch screen , video , audio . 
 
Can support Iphone (Type C) , phone control / lcd no control.
Can support Android phone ( both phone and lcdcan control.
Can support PC, and perhaps other devices no tested for external output.
 
Portable monitor, able to remove with one click.
 
HDMI install , (mini HDMI), requires power ( Type C) 5V2A.
Type C install, direct type C cable only.
 
Cables/splitters are sold separately , please enquire carefully how you want your setup to be .