IOGEAR's USB 2. 0 Automatic Printer Switch allows two PCs and/or Macs to share one printer or multi-function printer. Simply submit a print job and the printer automatically* switches to the preferred computer. The switch also enables two computers to easily share one external hard drive, scanner, or any USB device. No more plugging and unplugging between computers. * Automatic switch function is software based and only available with USB printer or the printer function of a multi-function printer. For connecting and using other types of USB devices, you can switch by using the push-button on the USB switch or with the included software.