Figure 1. Track Shoppers' Choices RFIDs are part of a tagging system that applies an Electronic Product Code to each RFID device or tag, which is then applied to the product or shipping material. In this retail example, the RFID tags are applied to the shipping case and the individual product, a can of beans. When a shopper picks up the beans at the grocery store, the scanning device, located on the shopping cart, monitors the location of the can and sends this information to the Retail Automation System's database.