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It is possible to connect a customer display (POS compatible) this is interesting in the case of a supermarket. Indeed the customer will be able to see the items as they are entered, but especially at the end the total to be paid. This type of display can be found in China for less than 40,000 CFA. Be careful however as already said on the choice of computers these are often connected by USB so make sure you have enough USB ports or equip yourself with a powered USB HUB.