Dell 56K USB External Modem Adapter, Dell Part Numbers: NW147, Model Number: RD02-D400. Features: Compatible With Any System That Supports USB Connectors, and is running Microsoft Windows XP or Vista, Interface Type: USB, Transfer rate: 56Kbps, Transfer Protocol: V.92, Error correction control: Support, Data Compression Protocol: Support, Chip: conexant, Fax / protocol: Class 1 and Class 2, Fax speed 14400bps, Video conferencing: V.80. Get connected quickly with one of our Genuine Dell modems.

Manufacturer: Conexant / Dell
Model Number: RD02-D400
Dell Part Numbers: NW147 0NW147 CN-0NW147
Compatible: Most any system with an available USB Port running Microsoft Windows XP or Vista
Dell Inspiron 1525 1526 Latitude XT E4200 E4300 E6400 Vostro 1310 1510 2510 XPS M1330 M1530 M1730 Studio 1535 1536 1735  Hybrid 140g USFF Precision M2400 M4400 M6400

Features:
Transmission Line: RJ11 / RJ12
56K data/fax modem with USB interface
Compatibility: AT and extended AT command set
Complies with V.17, V.29 and V.27ter group 3 fax protocol
Complies with V.90, V.42/V.42bis and MNP5 protocols
Conexant chipset
Supports auto dial, tone, pulse dialing, automatic answer and retrain
Supports caller ID, distinctive ring detect and automatic format/speed sensing
Supports data, fax/voice call discrimination, single configuration profile stored in host and call forward/fall-back
Supports Microsoft Windows 98 SE, 2000, Me, XP ,Win 7 and Vista
Up to 56Kbps data download, 48Kbps data upload and 14.4Kbps fax communication

Included:
56K Black USB Voice Fax Data External V.90 V.92 Modem