Philips SPM4500BB USB 800 DPI Wired optical mouse, Optical, USB Type-A, 800 DPI, Black, Grey Philips SPM4500BB USB 800 DPI Wired optical mouse. Movement detection technology: Optical, Device interface: USB Type-A, Movement resolution: 800 DPI, Buttons type: Pressed buttons, Buttons quantity: 3, Scroll type: Wheel. Product colour: Black, Grey