It can be connected e.g. one SSD by using an optional cable.
The card transmits PCI Express signals using the NVMe protocol.
Specification
Connectors:
1 x OCuLink SFF-8612 female
1 x PCI Express x4, V3.0
Data transfer rate up to 32 Gbps
Bootable, ex UEFI version 2.3.1
Supports NVM Express (NVMe) 1.2
Linux Kernel 4.3 or above
Windows 8.1/8.1-64/10/10-64
PC with one free PCI Express x4 / x8 / x16 / x32 slot