The invention is related to a portable electronic printing device equipped with a microprocessor, comprising a data processing module and a touch display designed for the user to communicate with the device and a printer module electronically connected and integrated in a single housing with the touch display equipped with a paper tray and an opening for paper output from the printer, characterised in that the opening designed for paper output from the printer (5) extends in parallel to the edge of the touch display (3) and is a located at a distance of not more than 80 mm from this edge, more preferably not more than 5 mm from this edge, and most preferably it is adjacent to this edge, wherein the housing of the said device has a back plane located opposite the touch display (3), the said plane being parallel to the surface of the touch display (3) at least in the part comprising the housing of the data processing module (2). The invention also relates to a use of the portable electronic printing device as part of the sales system.