To pursue its objective, the Fund is an actively managed exchange-traded fund (ETF) that seeks to generate attractive current income while providing protection against rising interest rates (i.e., an interest rate hedge). The Fund invests primarily in interest-only mortgage-backed securities (MBS IOs) and U.S. Treasury bonds. Under normal circumstances, the Fund will invest at least 80 percent of its net assets (plus any borrowings for investment purposes) in income producing fixed income securities. Mortgage-backed securities (MBS) are fixed-income instruments that represent an interest in a pool of mortgages. Stripped MBS also represents interest in a pool of mortgages, the cash flow from which has been separated into interest and principal components. MBS IOs represent the interest portion of the MBS. To provide an interest rate hedge, the Fund seeks to achieve a general duration target of approximately negative three to negative ten years (the Duration Target Range).