Food marketers who want to focus their pitches are rolling out a highly precise tool, a shopping cart that shows different deals in every aisle. The Giving Cart™ System from Klever Marketing® Inc. continuously alerts shoppers about promotions as they wind through the store. It's now being tested at The Market in Park City, UT. Previous attempts at target marketing flopped because ads showed up in the wrong place. The Giving Cart uses Time Domain Corp.'s Precision Location Ultra Wideband System, which is precise down to 12 inches. USB also offers longer battery life than some other wireless networks.