US Robotics 56K V.92 Serial Fun Modem. Modem speed: 56 Kbit/s. Data link protocols: V.92, V.90, V.34+, V.34, V.32bis, V.32, V.22bis, V.22, V.23, V.21. Minimum system requirements: CD-ROM. Package dimensions (WxDxH): 230 x 185 x 90 mm, Package weight: 1.13 kg. Certification: RoHS