Features: Ports: RJ11 (common telephone/dial-up modem interface) USB (type-A Male) Data mode capabilities: V.92, V.90 56 Kbps Fax Mode capabilities: ITU TV. 17, V. 29, v.27ter, and V.21 Ch2 Group3 FAX Error Correction capabilities: V.42, MNP4-2 Data Compression: V.44, V.42bis, MNP 5 Operating Temperature: 0¡ãC- 40¡ãC No external power supply required System Support: Windows 98 / 2000 / XP / XP64 /Vista 32 & 64 /Windows7 32& 64/Linux Note: Mac is not supported. Applications: Make Voice Calls from your PC Send/Receive Fax with your PC Connect to the internet at 56k dial-up modem speeds