The Aztech MDP3900V-U (B) Internal Modem is a reliable and high-performance modem card designed for easy installation on a PC. With its PC Card (PCMCIA) Type I form factor and compatibility with PCI ports, this modem offers a seamless and convenient solution for connecting to DSL or phone lines. Featuring dual ports, this Aztech modem provides versatile connectivity options for a variety of devices. Built with quality in mind, the MDP3900V-U is a dependable choice for those in need of a reliable internal modem for their computer system.