Philips SPK7204/01, Ambidextrous, Optical, USB Type-A, 1600 DPI, Black Philips SPK7204/01. Form factor: Ambidextrous. Movement detection technology: Optical, Device interface: USB Type-A, Movement resolution: 1600 DPI, Buttons type: Pressed buttons, Buttons quantity: 4, Scroll type: Wheel. Power source: Cable. Product colour: Black