... printer: 1.Printable lines:1-3 lines(adjustable) 2.Height of letter:2-10mm 3.Print speed:2m/s(7*5 format ... Printer, industrial ink jet printer, digital inkjet printer, barcode printer, label printer, inkjet printer, code spraying machine, wide format printer, laser print machine, large format printer ... , at most 120 characters to everyone5) Printer Object: Automatic clock, date, products counting ...