Function: 1 Plug & Play Suitable for WIN 98/2000 / ME / XP / Vista / CE5.0 / 10 / 8.1 / 8/7 No external driver required. 2. For GRIS, the cat can dial the internet, transmit and receive faxes, but it does not support voice calls. 3 56k data/fax modem uses USB 2.0 type A at full speed of 56kb/s. 4 Uses V.92, V.90 and V.42, V.42bis / MNP5 protocol. Fits V.17, V.29, and V.27ter Group 3 fax protocols. 5 Support automatic dial, pulse dial, automatic answer, automatic fax transmission and reception. 6 Supports caller ID, automatic format/speed detection, data/fax/voice calls, single call stored on the host, and transfer/transfer. 7 Up to 56k data download, 48k data upload, 14.4k fax communication. 8 Compatibility: Compatible with standard and extended AT command sets. Provides fast connection and maintenance capabilities for modems. Specifications: Type: Normal Dial-Up Modem Category: External Type Interface Type: USB Phone Connection: RJ11 Transmission Speed: 56Kbps Bus Power USB Devicea>