im looking into installing an x3 CE the spining thing in the upper left hand corner is a contrast controller for an optional LCD screen. not to sure what the LCD can do but thats what the "control knob" is for. heres a link that explains installation of the lcd and shows what the lil wheel is ([bold]http://www.teamxecuter.com/x3/lcd/?CMSSESSID=50cdc245f398da9ff5829ee2d2c43bbe[/bold]