Philips SPK7307BL/05, Ambidextrous, Optical, RF Wireless, 1600 DPI, Black Philips SPK7307BL/05. Form factor: Ambidextrous. Movement detection technology: Optical, Device interface: RF Wireless, Movement resolution: 1600 DPI, Buttons quantity: 3, Scroll type: Wheel. Power source: Batteries. Product color: Black