San Francisco -- Zoom Systems, a maker of automated robotic stores, said that it has raised $35 million in its fourth round of funding from Goldman, Sachs & Co., Sierra Ventures and Motorola Ventures. NeoCarta Ventures, which led the company's second round, also contributed. The company's robotic stores are located in high traffic areas, and allow shoppers to select products through a touch screen graphic interface. They can pay for items with a credit or debit card and receive them from a robotic arm. All of Zoom's stores are networked and centrally monitored. Over the next two years, Zoom said that it plans to implement several thousand of the units at airports, hotels, malls and retail stores.