XO 4-6 is the top model, and has the XO Smart Link as standard equipment. It includes a number of additional features: Large display on the instrument bridge Lumbar support for the patient chair Possibility to use XO Osseo surgical motor User Interface The user interface of XO 4-6 consist of the XO Foot Control, a joystick below the patient chair, and a large display on the instrument bridge. Each unit instrument, with the exception of the syringe, has its own display, showing the values of its primary driver parameters. The user interface and the functionality of XO 4-6 can be greatly expanded by using XO Smart Link. Click here to learn more about XO Smart Link.