The portable Bluetooth printer is a small, compact and easy-to-carry printer. It is mainly designed to meet the printing needs of users on the move. Applying Bluetooth technology to portable mini Bluetooth printers, to get rid of the inconvenience caused by printer connection, and achieve wireless printing. It is widely used in many office fields such as agriculture, forestry, animal husbandry, fishery industry and commerce administration, and supermarket storage and distribution. With the development of Bluetooth technology, people are more and more inclined to get rid of the shackles of wired devices, but due to the volume, only printers have no good solution. There are many types of printers on the market, while handheld Bluetooth printers are relatively few. According to the size of the machine can be divided into desktop Bluetooth printer, portable Bluetooth printer. According to the printing method, it can be divided into a pin Bluetooth printer and a thermal Bluetooth printer. Portable Bluetooth printers are widely used in various industries due to their compact portable belts, such as finance, retail, catering, lottery, transportation (including taxis, air tickets, road and bridge tolls, etc.), gas stations, medical care, The wireless data communication technology of mainstream Bluetooth portable printers, such as postal, utility meter reading, and police and government affairs systems, has the advantages of low power consumption and non-directionality, the disadvantage is that the transmission distance is limited, and the initial setup and pairing are more complicated.