This is the IO Audio Port (headset jack), with cable for the Latitude 13 (3380) and Chromebook 13 (3380).

Compatible Dell Laptops/Notebooks:
Latitude 13 (3380)
Chromebook 13 (3380)

DPN: 153FW

alternate Part Number's:
Keystone13 AUDIO BD Cable
450.0AW01.0001