... bar,vertical bar,dot-matrix,bold font can be free change.Print ContentReal Date, Real time, Photo, Letter, Shift group ... Batch number, Lot number Barcode and 2D code can be free print.Print DirectionUpward printing, downward printing, side printing(360°direction printing ... regular maintenance); Oil-based ink (machine maintenance free).It can be print on the surface of plastic,glass,metal,paper ...