US Robotics 56K USB Soft modem - Fax/Modem (USR5639) USB convenience and ease of use Advanced Features and functionality Get the speed you need Simple Installation Excellent compatibility The USRobotics USB Softmodem is fully compatible with V.92 and lower rates, making it ideal for compact POS solutio Broadly compatible with Windows including 64 bit and server systems, the modem uses the CPU of the host computer for high compression throughput due to direct parallel access. Features include ring detection and qualification - eliminating unintended wake-on-ring events due to activity on the phone line other than ringing, as well as handling pulse dial control to eliminate system timing dependencies common with soft modems.