... fashionable computer input device in today's world market this wirelss mulltimedia keyboard with trackball is one of the most fashionable computers ... world market,,which combines the 2.4GHz wireless radio frequency,optical trackball,two mouse keys and scroll wheel,it will ... keys :82 keys and 14 Internet/Multimedia Hot Keys Trackball OPtical trackball 1000Dpi 3 Mouse buttons ,1 scroll wheel USB Receiver ...