Chipset: Conexant - Interface: USB 2.0 - Transmission rate: 56K - Data protocol: ITU-V.92 V.90 V.34 V.32bis V.32 V.22bis V.22 V.23 V.21 Bell212A 103 - Data error correction: V.42 MNP2-4 - Data compression: V.44 V.42 bis MNP 5 - Command system: EIA / TIA578 Class1 compatible with HaysAT command set - Flow control: Software (XON/XOFF) or Hardware (RTS/CTS) - Dial mode: Audio pulse - Quick lightning protection circuit - System requirements: Celeron300 or PentiumMMX266 above - Driver supports Windows 98 98SE ME 2000 XP Vista 7 - Cable length: 10cm - Accessories: - 1 x Telephone line (100cm) - 1 x Software CD - 1 x English manual