The Belkin Combo FireWire IEEE 1394 Cardbus PC Card Laptop Adapter is a plug-in card that serves as a Cardbus adapter with two ports, one USB 2.0 and one FireWire 400. It is designed to be compatible with PC Cards and comes with a software CD kit for easy installation and use. The model number for this adapter is F5U512, P80691 making it a reliable and efficient choice for expanding the interfaces of your computer or laptop for enhanced connectivity options.