Invoice printer or tax-controlled billing machine. According to the inquiry of Pacific Science and Technology Network, the main function of invoice printer or tax-controlled invoicing machine is to print invoices and issue tax-related invoices. Invoice printer refers to the equipment that can print invoices, which is usually used for business premises or individuals to issue sales invoices. Tax-controlled billing machine refers to an invoice printer with tax management function, which can automatically record sales data, generate invoices and upload them to the tax system to realize tax management and monitoring. These names are intended to accurately describe the function and purpose of the equipment.