Kensington Pro Fit® Full-Size Mouse USB, Optical, USB Type-A, 2400 DPI, Black Kensington Pro Fit® Full-Size Mouse USB. Movement detection technology: Optical, Device interface: USB Type-A, Movement resolution: 2400 DPI, Buttons type: Pressed buttons, Buttons quantity: 3, Scroll type: Wheel. Power source: Cable. Product color: Black