This 3Com Megahertz PCMCIA 56k Win Modem PC Card with XJACK 3CXM356 is the perfect addition to your laptop or desktop. With a maximum data rate of 56 Kbps, this modem is great for DSL/Phone (RJ-11) networks. The unit type is a single unit, and it comes with one network port. The 3Com brand is known for its quality products, and this modem is no exception. It is designed to work with PC Card (PCMCIA) Type II form factors and is compatible with Windows operating systems. This modem card is a great choice for anyone looking to upgrade their laptop or desktop's networking capabilities.