One Step Update your Computer to 7 ports USB3.0(2xType C+5xType A) Easily with PCI Express to USB3.0 Controller Adapter CardSuperSpeed USB 3.0 supports transfer rates of up to 5Gbps - The actual transmission speed is limited by the setting of the device connected.Backwards compatible with USB 2.0 and 1.1 devices; Operating System Compatibility: Windows XP/Vista/7/8/10/MAC Pro 10.8.2 AboveWith quick and easy installation, this USB 3.0 PCI express I/O Card offers a simple solution for connecting to and using USB 3.0 devices on your standard desktop PC. Enjoy copying videos, music, photos, data files between USB devices and the computer at blazing fast speeds.If the card doesnt work properly from the start, you may try out the following steps Step 1: de- and reattach the devices to be recognized, so the system can try another recognition search. Step 2: Augment with the optional power supply, so an automatic search can be retried. Step 3: Check the PCI-E socket on the main board for possible faults. Step 4: Try out another Mac Pro, if available, to determine the cards general functionalitysize:8.1x10x1.8cmMaterial:PCBcolour:BlackPackage Contents:1 x USB 3.0 Ports Expansion CardOnly the above package content, other products are not included.Note: Light shooting 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.