The fund invests at least 80% of its total assets, plus borrowings for investments purposes (if any), in the securities of the underlying index and in American Depositary Receipts ("ADRs") and Global Depositary Receipts ("GDRs") based on the securities in the underlying index. The underlying index is designed to track the broad-based performance of the U.S.-listed variable rate preferred securities market. It is non-diversified.