Universal Serial Bus (USB) delivers the fastest and most convenient hook-up for both PC and Macintosh computers, you don't even have to shut off your computer. Connect Faster: Quickconnect reduces the start-up time required to establish a connection. Cut your connect time by up to 40% or more. Download Faster: New V.44 compression delivers up to 40% more throughput for HTML documents and pages. Internet Call-Waiting: Modem-on-Hold allows you to receive an incoming call and stay connected to the Internet. (Internet Call waiting drivers and application for Windows 2000 and XP only. Call-Waiting service from your phone company is required.)Controller-based Modem delivers the reliability of a hardware-based connection with using your PC's processor.