Features: 1.Rear SATA3.0 interface: The new update extends the four rear SATA3.0 interfaces, which is more suitable for narrow spaces. 2U can also be better repaired; from the back wiring, there will be no connection to the video card. 2.Universal 4U, 2U: this product is equipped with double fixed 4U, 2U brackets, which are supported by large or small housing. 3.Larger heat sink: better heat dissipation and more suitable for long working hours. 4.PCI-E interface: is easy to install into the PCI-EXPRESS slot of the case with thick gold plated PCI-E interface.Better contact and easy data transmission can effectively reduce data loss. 5.The tail is designed to be in one plane: the probability of blocking the fan of the video card is less. 6.Four-layer printed circuit board with middle insulation layer for stronger anti-interference capability. 7.Original mode selection: AHCI, IDE, data drive, three modes to choose from. Specification: Model: SA3004 Bus interface: PCI-E X1 (compatible with X4, X8, X16/graphic interface) Number of interfaces: SATA3.0.4 interface System support: for Windows XP/2003/Vista/Win7/Win8/Win10 (32/64 bit) Size: approx. 120 x 65 x 56 mm, 4.7 x 2.6 x 2.2 inch (as shown in the pictures) Weight: approx. 89g Package list: 1 x Extensions tab 1 x 2U partition 2 x screw