Function: USB3.0 19PIN expansion that provides two 9PIN ports by converting the motherboard 19PIN header to two USB2.0 interfaces. Supports watercooling color lighting systems and fan speed measurement. Connectivity: Adapts 19PIN to 9PIN interfaces on the motherboard, enabling the simultaneous connection of two USB2.0 devices. Compatibility: Designed for motherboards equipped with USB3.0 headers that need USB2.0 expansion. Performance and installation: Delivers efficient and stable connections with easy installation. Applicable to a variety of devices and enhances system expandability. Use scenarios: Upgrade a USB3.0 motherboard to add two USB2.0 ports for keyboards, mice, USB drives, or other USB2.0 peripherals. Use in watercooled PC builds that require USB2.0 headers for RGB lighting controllers or fan speed monitoring. Ideal for compact or budget builds (HTPC or small form factor) that need additional USB2.0 connectivity without adding extra PCIe hardware.