Ink-free Printing, Cost Saving, USB+Bluetooth- Advanced Direct Thermal Technology Ink-less Printing, No Need Of Print Cartridges Or Ribbons, Paper Size:-Any 2inch:- 55,56,57,58Mm. You Can Print Bill, Receipt, Post Receipt, Restaurant Orders.- Printer Built-In Bluetooth 5.0 You Can Print Wirelesly With Mobile Phone (iOS,Androoid) & Wired USB Cable Connection With Windows PC/Laptop.- 90-100Mm/S Print Speed, 203Dpi Resolution. Compatible With iOS Android, Windows