1.) It is an internal Mini Serial Attached SCSI HD x4 (SFF-8643) to SFF-8643 adapter. It can connect two SFF-8643 connector together.2.) The High Density (HD) system referenced as HD Mini-SAS (SFF-8643) in the SAS4.0 standard, meets the 24Gbs SAS specification.3.) These HD Connectors be used on the SAS4.0 specification when it is released. Cable material may change but the connectors be generation of SAS to run at 24Gbs.4.) Smaller size connector and cable saves device space, Applications for Servers,Data Storage,Workstation,Meet PCIe Gen34 and SAS4.0 specification.5.) Provide four channels signal transmission as per industry standard,Data speed: 24Gbps for SAS and 8GTs for PCIe per channel.Color: BlackMaterial: Plastic + PCThe words on the product due to different product batches, but it not affect the usePackage Contents:1 x PCI-Express 4.0 AdapterOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +- 1-3cm.