Genuine Dell original OEM IO Circuit Board, sometimes called a Databoard or Daughterboard- this houses one USB port, CMOS battery connector, and one SD Card Reader Slot- compatible with the Inspiron 3781 systems .
Compatible Dell Laptops/Notebooks:
-Inspiron 3781
DPN: T7MK7
alternate Part Number's:
CAL70_IO_BOARD_FFC
NBX00028F00