Smart shelves automatically keep track of inventory in a retail store using wireless inventory control systems that are fitted with weight sensors or other solutions. The weight sensors are integrated into the shelf itself or installed under normal shelves. These weight sensors consistently notify the back-end system about the existing quantity of items on the shelves. Alternatively, wireless devices can use RFID tags and readers to scan products in the display and stock shelves when items are checked out. In addition to sensing items, smart shelf solutions often also include electronic pricing labels that allow the price tags to be easily changed digitally. Some solutions also allow customers to use their smartphones to scan shelf labels in order to display additional information such as nutritional labels directly on the phone.