The LQ-590II offers an improved USD (ultra speed draft) speed of 550 characters per second at 10 characters per inch, making a real difference to high-volume print runs such as stock reports and large batches of invoices or freight documents.
Specification: 
Fast print speed USD speed of 550 characters per second at 10 characters per inch
Increased reliability Mean time between failure of 25,000 power-on hours
Flexible printing 24-pin, 80-column dot matrix printer
Increased number of copies Now original plus six copies
Same consumables Uses the same ribbons as existing models
Warranty: 
Warranty: 2 years warranty