This is the USRobotics Courier V.Everything V92/V90/etc External "Mission Critical" Modem, considered hands down the best modem available
Features 56Kbps RS-232 (Serial Port) ITU V.92/V.90 up to 56 Kbps downloads Data: V.92, V.90, V.34, V.32bis, V.32, V.22bis, V.22, V.23, and V.21 ITU V.34 at 33.6 Kbps or 28.8 Kbps V.32 at 19.2 Kbps.
Includes USR3453C modem, power supply, serial cable, phone cable, Installation and Documentation CD, Quick Start Guide.