1.Due to the increasing number of USB devices nowadays, the USB ports on the chassis are not enough for use! You can use this device to directly convert the USB 19pin+9PIN interfaces on theboard into 2 USB3.0 interfaces+2 USB2.0 interfaces, and you can turn the switches to the panel and install it in an idle optical drive position. This provides a front USB interfaces, and you no longer need to bend over to plug in the cable, which is very convenient! 2.Special notice: This panel is installed in the optical drive position of the chassis, which is the size of 5.25-inch optical drive. 3.If this panel is plugged into the USB2.0 interfaces, it cannot increase speed when using USB3.0 devices.When purchasing, please check if the fixing screw hole of the optical drive position in the chassis is long. If it is a round hole, please check the size by to avoid uneven installation of the chassis and causing unnecessary trouble! 4.The audiois directly pulled out of the motherboards, and the sound quality is only related to the motherboards and playback device. The cable does not change the sound quality, what happens when the motherboards comes out?