You can use this device to directly convert the 2 USB 9-pin interfaces on the board into 4 USB2.0 interfaces and install them in the idle PCI bracket position. This provides a rear USB interface, which is very convenient! Model: 4USB-N01 Interface: Dual 9PIN to 4-port USB2.0 Input interface: USB2.0 9PIN Interface rate: USB2.0 480Mbps/s (actual speed depends on the motherboard and the device used) Supported systems: WINXP/WIN7/8/10/11/2003//LINUX Note: One 9PIN corresponds to 2 USB ports, and the USB9PIN must be plugged in for normal operation (The product printed words depending on the batch, but this does not affect use) Color: Black Material: plastic Package Contents: 1 * Expansion Card Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.