Sitecom ISDN USB Adapter. Host interface: USB, Output interface: USB 1.1 - S/T ISDN. Data transfer rate: 12 Mbit/s. Package weight: 352 g. Cables included: 1 x USB 1 x Telephone. Data link protocols: ISDN, Package dimensions (WxDxH): 170 x 240 x 180 mm, Compatible operating systems: Windows 98, 2000, ME, XP