The USRobotics USR5686E modem, with 56Kbps max. transmission speed, is efficient at work. You can now quickly go online with this USRobotics Modem giving quick access to web content when connected to a PC. With a 14.4 kbps fax speed, this External Fax Modem quickly transfers your documents. Missing a phone call is not possible as this USRobotics Modem has 56K compatibility with local analog phone line. This External Fax Modem has RS-232 interface, which uses lower voltage, regulating the strength of signal. The USRobotics USR5686E, with V.42 bis/MNP 5 data compression, enhances throughput without altering the transmission speed.