This converter allows Rabbit-based systems to be programmed via the USB (universal serial bus) port rather than directly from a serial port. This is necessary if your laptop or computer lacks a serial port, which often is the case. Even if your computer has a serial port, you will gain improved performance by using the converter, as the maximum data rate will be increased from 115,200 bps to 460,800 bps. You will still need the serial programming cable. This converter has been verified for operation with Dynamic C and the USB-compatible Windows operating systems: 98, 2000, XP, and ME.