All the price labels in this supermarket appear on these LCD devices. After interrogating a shop assistant, I learn that all price displays in the supermarket can be changed remotely from a central location. The price displays are even solar powered so they don't need to be touched once set. Not only does this save time in getting a human to write out a new price label and replace it manually, if the store needs to add 5% on top of all items, it can be done in an instant.