Feature: 1. 56KBPS RATE: USB 2.0 fax modem has a stable transmission rate of 56Kbps and supports V.90/K56 transmission protocol, which ensures efficient data transmission. 2. QUICK CONNECTION: USB data modem can be quickly connected to a phone line for dial up Internet access, fax receiving and sending functions. 3. MULTI SOFTWARE COMPATIBILITY: USB 56K external modem can download the fax software by itself, and support many kinds of fax software, such as the system comes with, for aofax, for bitware, for winfax, etc. 4. EASY TO USE: USB 2.0 fax modem simply connects to your computer through the USB port to complete fax and dial up operations. 5. SUPPORT OS: USB 2.0 56K external dial up voice fax data modem for Win 10/8/7/Vista/XP, for LINUX. Specification: Item Type: USB 56K External Dial Up Fax Data Modem Material: ABS Interface Type: USB Transmission Rate: 56Kbps Transmission Protocol: V.90/K56flex Fax/Protocol: V.17, V.29, Group 3, Class 1 Main Functions: Dial the Number of the Internet, Automatically Send and Receive Faxes OS: for Windows 98/2000/xp/vista/WIN7/WIN8 /WIN10/WIN11,32/64bit, for LINUX. Compatibility: Compatible with AT and Extended AT Command Set.. Package List: 1 x USB 56K External Dial Up Fax Data Modem1 x RJ11 Telephone Cable1 x Instruction Manual1 x CD ROM