Pair / Mirror my android phone

Dear all ,
My car is Lexus RX270 , i want to pair / mirror my android phone screen to my Nav Screen , i already open the nav panel
Here is the picture
http://prntscr.com/925vfz
Could someone explain what the purpose of the cable connection that i marked on that pict ? , if i bought the interface from car-solutions.com can i do it with my self ? no need to bring it to the local dealer ?
Thanks for all your help.
My car is Lexus RX270 , i want to pair / mirror my android phone screen to my Nav Screen , i already open the nav panel
Here is the picture
http://prntscr.com/925vfz
Could someone explain what the purpose of the cable connection that i marked on that pict ? , if i bought the interface from car-solutions.com can i do it with my self ? no need to bring it to the local dealer ?
Thanks for all your help.