Feature:1. DUAL RJ11 PORT: The USB data modem utilizes dual RJ11 ports for connecting two fax phone lines or a telephone at the same time.2. SUPPORT CALLER ID: USB data modem adopts for Conexant93010 main chip, support Caller ID, compatible with AT and extended AT command set.3. EASY TO USE: USB 56K external modem is easy to use and supports stable fax sending and receiving.4. SUPPORT OS: Computer laptop fax modem supports for Windows 98/2000/xp/vista, for WIN7, for WIN8 , for WIN10, for WIN11,32/64bit, for LINUX operating system.5. ANTI THUNDER: Dual RJ11 Port USB fax modem is protected by fast anti thunder defend circuit to enhance thunder resistance.Specification:Item Type: USB 56K External Dial Up Fax Data ModemMaterial: ABSMain Chip: for Conexant 93010 Interface Type: USB Transmission Rate: 56Kbps Transmission Protocol: V.90/K56Fax/Protocol: V.17, V.29, Group 3, Class 1 Main Functions: Unplugged Internet Access, Auto Send/Receive FaxesOS: for Windows 98/2000/xp/vista, for WIN 7 8 10 11 32/64bit, for LINUXCompatibility: Compatible with AT and Extended AT Command Set..Package List:1 xUSB 56K External Dial Up Fax Data Modem1 x RJ11 Telephone Cable1 x Instruction Manual1 x CD ROM