Compatible with most mainstream motherboards and chassis designs Designed for systems that use USB3.0 motherboards but need to expand USB2.0 interfaces USB3.0 19pin expansion interface provides two USB2.0 9pin ports; compatible with watercooled setups that include RGB lighting and fan speed measurement Efficient and stable connection performance; easy installation; suitable for a variety of devices; enhances system expandability Use scenarios Upgrading a modern PC with limited USB2.0 headers to support additional USB2.0 peripherals such as front panel hubs, external drives, or legacy devices without sacrificing USB3.0 performance Building a compact or custom watercooled system that requires extra USB2.0 headers for RGB lighting controllers and fan speed monitoring, while keeping the USB3.0 backbone intact Replacing or expanding USB connectivity in workstations or home theaters where multiple USB2.0 connections are needed for peripherals, diagnostics, or auxiliary devices, with straightforward installation and reliable performance