Fujitsu WI660, Ambidextrous, Track-on-glass (TOG), RF Wireless, 2000 DPI, Black Fujitsu WI660. Form factor: Ambidextrous. Movement detection technology: Track-on-glass (TOG), Device interface: RF Wireless, Movement resolution: 2000 DPI, Buttons quantity: 8, Scroll type: Wheel. Power source: Batteries. Product color: Black