This is a replacement I/O board for the 13 Retina MacBook Pro released in Late 2013..
This sits on the right side of the machine and includes a USB port, thunderbolt port, and SD card reader..
I/O board contains ports for HDMI, SDXC, and USB 3.0.
Part Numbers: 661-8155.
Printed Number: 820-3539-A, 821-1790-06.
<li class="maclist-li"><h4>Compatible with : </h4>
<ul>
Pro Retina 13 (A1502, Late 2013/ Mid 2014).