This 5.25inch bay USB expansion panel converts motherboard USB headers into front panel USB interfaces, providing two USB 3.0 ports and two USB 2.0 ports for convenient access. Key benefits Front access to USB 3.0 and USB 2.0 ports: two USB 3.0 and two USB 2.0 ports are available at the front of the case for easy connection of drives, peripherals, and accessories. Improves usability and cable management: eliminates the need to bend to the back of the PC to plug in USB devices. Clear impact on audio remains unchanged: the audio signal is connected to the motherboard and playback device; the USB panel does not alter or affect audio performance. Compatibility with motherboard headers: uses motherboard USB 19pin and 9pin interfaces to provide the front panel ports; speed is limited by the connected header. How it works and performance The panel converts motherboard USB 19pin and 9pin headers into 2 USB 3.0 ports and 2 USB 2.0 ports on the front panel. If the panel is connected to a USB 2.0 header, USB 3.0 devices will not operate at USB 3.0 speeds. For full USB 3.0 performance, connect to a USB 3.0 header. Installation notes Fits standard 5.25inch optical drive bays for mounting in the front of the chassis. When installing, check the chassis fixing screw holes for the optical drive position: If the hole is long, ensure screw length suits the mounting. If the hole is round, verify the diameter to avoid uneven installation and potential trouble. Special notice This panel is designed to be installed in the optical drive position of the chassis, corresponding to a 5.25inch drive bay. Use scenarios Desktop expansion: add front USB 3.0 and USB 2.0 ports to a desktop PC with insufficient front panel connectivity for external drives, hubs, or devices. Home theater or media PC: provide convenient front access to USB devices for media players, USB storage, or peripherals without reaching behind the tower. Reusing older chassis: retrofit an older PC case by installing this panel in the 5.25inch bay to gain front USB ports where none exist.