Using this USB to Centronics parallel printer cable is easy. First, plug one end of the cable into the USB port of your computer. Then, connect the other end to the parallel port of your older printer. Once connected, your computer should automatically detect the printer if it's running a compatible operating system like Windows 98SE, ME, XP, etc., or Macintosh OS v8.6 - 9.2. As for the transfer rate, it can reach up to 12Mbps, which is quite fast for data transfer between your computer and the printer. When it comes to maintenance, keep the cable away from sharp objects to avoid any damage to the wires inside. Also, make sure to unplug it gently to prevent any loose connections. Don't worry about the packaging. Even though it may vary, the cable and its functionality are exactly as described. With our 25 - year - long experience in the industry, you can trust the quality of this cable.