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In an age where everyone is supposedly asking "How can we save electricity?" the idea that we are putting energy into manufacturing and powering tiny advertising screens like this is frightening. And combined with the noise of the other shoppers and carts and kids and music, it was just annoying.
If marketing folks want to be able to put more information in front of shoppers, I think that the way of the future is the smart-phone-scannable Quick Response (QR) code. Everyone is switching to smart phones. (And even if you don't want to, you're going to need to because your old phone will wear out and you won't be able to get a new battery for it.) Using a QR scan, you can find out more info, get instructions for using the product, get special offers, etc. This is a much better technology to invest in, retail folks. Please don't start investing in your own little in-store TVs.