Displays for buyers are special devices designed for product information display. According to the rules of retail trade, the installation of such devices is compulsory. The displays for buyers display the product descrition, its price, total price, discount, etc. Furthermore, displays for customers may display a variety of advertising and promotional messages addressed to visitors of the store. The screens of these displays may be liquid crystal, and the fluorescent and the volume of information may fit in one or more lines, the permissible number of characters of which can be different. Such equipment as displays for customers works in complex with the POS-terminals and computer systems, cash registers and is typically used for providing for customers the necessary information about each of the purchased goods to be added to the receipt during service at the checkout. Displays are installed directly in the working place of the cashier, and connected to a computer through RS232 interface or USB, as the power is supplied though an external unit.