Features: USB 3.0 supports transfer rates of up to 5Gbps. The actual transmission speed is limited by the setting of the device connection. Supports 2 downstreams port for all speeds. Hot-swappable, plug and play; Low Energy Consumption. Sufficient and stable power supply to ensure stable operation of equipment. Backwards suitable for USB 2.0 and 1.1 devices; Supports simultaneous operation of multiple USB 3.0/2.0/1.1 devices Specifications: Component:PCB Product interfaces: USB3.0A female (backwards compatibility USB2.0) Product interfaces: PCIE (can be plug into 4X/8X/16X) Product speed: 5Gbps Size:Approx.12cm/2.72inch Package Includes: 1Pc Expansion Card note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.