Function: increase the computer USB interface. Usage: Baffle is fixed on the chassis and then insert the line motherboard USB pin. The four lines are defined as follows: red is + 5V(VCC) white is the Data(Data) green is the Data(+ Data) black is the ground(GND). Note: this card can only be the mainboard of USB2.0 stitch extended USB2.0 interface without a conversion function as the mainboard USB1.1 interface for that transfer the interface for the same USB1.1 interface. The product description: USB 2.0 four dampers using the case of the internal motherboard USB interface which leads to the four USB2.0 high speed interface backboard frame no need to install the driver plug and play. Computer case external extension four USB interface.