Antenna cable -usb external hard drive SSD expansion card Highlights generic brand usb external hard drive SSD expansion card Description: Dual interface U.2 SFF-8639 to PCIE desktop SSD expansion card 3.0 X4/X8/X16 SFF-8639 The computer motherboard PCIE interface can be converted into two U.2 SFF-8639 solid-state drive interface Allows the desktop computer to install two additional U.2 SSD hard drives to further improve computer performance Compatible with PCIE3.0/2.0/1.0, support all computer motherboards with PCIE slots You can install the fixing screws directly after you have inserted the interface, without drive or data cable. Specification: Function: U.2 to PCIE X8 X16 Size: 150 x 60 x 5mm/5.9 x 2.3 x 0.2in Transmission rate: >40Gbps Package includes: 1 piece U.2 to PCI Express Adapter (2 Pack)