Thermal Receipt Printer USB Mini Portable Bluetooth HD Printing for POS Office Electronics Item Type: Thermal Receipt Printer Material: ABS Battery: 1 x Polymer battery, Battery Capacity: 1500mAh Paper Specifications: Approx. 57mm / 2.24in x dia 50mm / 1.97in Printing Method: Line printing Printing Width: Approx. 48mm / 1.89in Paper Width: Approx. 58mm / 2.28in(57.5±0.5mm) Columns: 384 Dots/line Dot Density: 8 Dots/mm Maximum Printing Speed: 90mm/s Paper Thickness: 0.06-0.08mm Printing Command: POS or ESC Barcode Type: 1D: UPC A, UPC E, JAN13(EAN13), JAN8(EAN8), CODE39, small memory card(not include), CODABAR, CODE93, CODE128 2D: QR CODE Paper Roll Diameter: ≤ Approx. 41mm / 1.61in Connection Type: USB and Bluetooth(55m) Print Head Life: 50km Mean Time Between Failures: 3000 Hours Support APP calibration and firmware upgrade