Features 1. DUAL RJ11 PORT: The USB data modem features dual RJ11 ports to connect two fax phone lines or a telephone simultaneously. 2. SUPPORTS CALLER ID: Equipped with the Conexant 93010 main chip, this USB data modem supports Caller ID and is compatible with AT and extended AT command sets. 3. EASY TO USE: The USB 56K external modem is user-friendly and supports stable fax transmission and reception. 4. COMPATIBLE WITH MULTIPLE OPERATING SYSTEMS: Supports Windows 98/2000/XP/Vista, Windows 7, 8, 10, 11 (32/64-bit), and Linux operating systems. 5. ANTI-THUNDER PROTECTION: Built-in fast anti-thunder defense circuit enhances protection against electrical surges. Specification Item Type: USB 56K External Dial-Up Fax Data Modem Material: ABS Main Chip: Conexant 93010 Interface Type: USB Transmission Rate: 56 Kbps Transmission Protocol: V.90/K56 Fax Protocol: V.17, V.29, Group 3, Class 1 Main Functions: Internet access via dial-up, automatic send and receive faxes Operating Systems: Windows 98/2000/XP/Vista, Windows 7/8/10/11 (32/64-bit), Linux Compatibility: Compatible with AT and Extended AT Command Set Package List 1 x USB 56K External Dial-Up Fax Data Modem 1 x RJ11 Telephone Cable 1 x Instruction Manual 1 x CD-ROM