Model-GP3120TU, Printing method-Thermal, Resolution-203DPI, Paper width-25-82mm (3.25) inch/s, Printing speed-2-5inch/s, Reservoir: DRAM-2M FLASH:,2M, Test printer head temperature- Touch the switch slightly, Explore paper-Photo sensor, Interface-USB, External roll diameter-Max:115mm, Inner roll diameter-Min:25mm, paper type-Tear off and peel off, Barcode-CODE128,EAN128,ITF,CODE39,EAN13,EAN13+2,EAN13+5,EAN8,EAN8+2, EAN8+5,CODABAR,POSTNET,UPC-A,UPCA+2,UPCA+5,UPC-E,UPCE+2, UPC E+5,CPOST,MSI,MSIC,PLESSEY,ITF14,EAN14 Barcode setting Single character: FONT 0 to FONT 8 Extension and rotation character the character can, be extended 1-10 double in crossing and portrait, printing rotation(0°,90°,270°, 360°) Graph image file as PCX and BMP can be downloaded to FLASH and, DRAM, Warranty-1 Year.