This is a genuine Dell replacement Right Side IO circuit board with USB jack, Audio ports, 1394 port, RJ-45 , and SIM Card Reader- for the Dell Latitude E4300 motherboard.
This board also has the slots for the WLAN / WIMAX and WWAN lost.
Compatible ONLY with the Dell Latitude E4300.
DPart Number: M770D
or Compatible DPart Number: CVC2R
see picture..