US Robotics USR802972B-OEM. Modem speed: 56 Kbit/s, Interface: PCI. Minimum system requirements: CD-ROM PCI, Minimum processor: 486DX/Pentium, Minimum RAM: 32 MB. Operating temperature range (T-T): 0 - 50 °C, Operating relative humidity range: 20 - 80 %, Storage temperature range (T-T): -20 - 70 °C. Certification: FCC (Part 15) FCC (Part 68) UL60950-1 and CUL ICES-003 CS-03 CE mark