Can you imagine how difficult it is for all the sales staff as well as consumers if we still use manual scanning of goods in a shop or supermarket. I remember when I was in high school and the grocery stores in our hometown did not have yet scanner. All items and prices at the stores were manually billed by the cashiers which caused long queues during checkout. Nowadays, the items purchased can easily be billed with the use of cordless barcode scanner. Thanks to modern technology and to the inventor of the device.