The perferct addition to your home theatre. * 2.4 GHz ISN band radio frequency * Error detection ability * 12m wireless working distance * Patented optical trackball 800 DPI * Mouse left key, right key and scroll wheel All in One! * Hot keys for multimedia and internet * Windows Me / 2000 / XP / Vista, Mac OS * Dimension: 340 x 163 x 31.5mm ( L x W x H )