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Retailers use new tech to track you in stores -- and in dressing rooms

Smart shelves know what products you touch, shopping carts come loaded with tablets, and dressing room mirrors track what you try on and ask for your phone number. The National Retail Federation's annual trade show reveals how tech changes the way we shop.

Why does a dressing room want your digits?

Retailers are incorporating new sensors and screens into stores to better track customers. Sometimes, that means having a smart fitting-room mirror use RFID to know which outfits you tried on and save it to your profile with a phone number.

It's not just the dressing room that's getting a high-tech makeover. Shopping carts come with tablets to keep track of your spending and show ads for products in your aisle. And shelves are watching which products you pick up.

At the National Retail Federation's annual trade show in New York, we get a taste of new tech coming to a store near you:

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Retailers use new tech to track you in stores -- and in dressing rooms