Feature 1DUAL RJ11 PORT: The USB data modem utilizes dual RJ11 ports for connecting two fax phone lines or a telephone at the same time. 2SUPPORT CALLER ID: USB data modem adopts for Conexant93010 main chip, support Caller ID, compatible with AT and extended AT command set. 3EASY TO USE: USB 56K external modem is easy to use and supports stable fax sending and receiving. 4SUPPORT 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. 5ANTI THUNDER: Dual RJ11 Port USB fax modem is protected by fast anti thunder defend circuit to enhance thunder resistance.Item Type:USB56KExternalDialUpFaxDataModemMaterial: 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. .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x USB56KExternalDialUpFaxDataModem1 x RJ11TelephoneCable1 x Instruction Manual1 xCDROM