Features: Brand new and high quality 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! Special notice: This panel is installed in the optical drive position of the chassis, which is the size of 5.25-inch optical drive. 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 one by one to avoid uneven installation of the chassis and causing unnecessary trouble! The audiointerfaces is an HDAUDIO interfaces , which requires the motherboards to support the HDAUDIO audiointerfaces in order to use it. Currently, all motherboards on the market support the HDAUDIO interfaces .If the audiooutput is set to AC97 in theBIOS, please switches back to the HDAUDIO interfaces , otherwise there will be no sound. 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? Specifications: Material: ABS & Metal interfaces : 2 Port USB3.0 + 2 Port USB2.0; Input interfaces : USB3.0 19Pin, USB2.0 9Pin Mounting Options: 5.25inch CDROM Drive Bay Package Includes: 1 x USB Front Panel note: No retail package. Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!