The Network I/O Adapter is a unique expansion solution developed for the Portg 3xxx series. It features all the interfaces you'll need to connect with desktop peripherals, including a USB port and external monitor port. And it connects with your Portg 3xxx-series notebook via a future-proof PCI serial port. The Network I/O Adaptor is also equipped with an Intel Ethernet chip, making it the ideal solution for networking your Portg 3xxx series notebook.