This is the Audio Port IO Circuit Board / Cable, for the Alienware x17 R1 / R2. This houses the Universal audio jack at the right side of the laptop- for connecting headphones or a headset (headphone and microphone combo).
Compatible Dell Laptops:
Alienware x17 R1
Alienware x17 R2
DPN: PX4XD
alt Part Number's:
GDS70_AUDIO_CABLE
DC02C00SC00
LF-K47CP