http://www.smartprinter.co.il/images/lpt2usb-device.gif

The device's PCB can also be installed internally inside almost any printer, since the circuit inside the device consumes less than 100 

The LPT2USB Device is designed to interface the PC Parallel port to USB printer port, enabling modern printers to work with legacy applications.

Many new printers today don't have a parallel port, the legacy printer port. Some application or hosts still needs the parallel port for printing.

Many new printers today don't have a parallel port, the legacy printer port