Hayes Zoom V.92 External Serial Modem. Modem speed: 56 Kbit/s. Data compression: V.44, V.42bis, MNP5, Supported protocols: V.92, V.90, V.34, V.32bis, V.32, V.22bis, V.22A/B, V.22, V.23, V.21, Bell 103/212A. Minimum system requirements: RS-232/COM, Compatible operating systems: Windows Macintosh Linux. Compliance certificates: RoHS, CE, Federal Communications Commission (FCC), UL, cUL, Certification: FCC Parts 15B/FCC Parts 68/UL/C-UL/CE/RoHS. Depth: 112 mm, Height: 146 mm, Width: 28 mm