Advantech UNO-148 - Pcie Expansionx4 (UNO-148-P11 EA)

UNO-148 User Manual 46
3.7.3 PCIe Expansionx4 (UNO-148-P11EA)
You can additionally install 2nd stack expansionx4 kit (PN: UNO-148-P11EA) on
UNO-148 to expand its functionality:
The accessory list for iDoor extension kit (PN: UNO-148-P11EA)
8x M3x4L screws for extension kit installation