The DU-5K-TB keyboard features one of our most popular industrial keyboard layouts with an integrated, 25mm laser trackball. It is constructed with a highly rugged, ABS polycarbonate case and industrial silicone rubber keypad. The DU-5K-TB is completely sealed and designed to meet NEMA 4X specifications. The trackball pointing device is removable for convenient cleaning and has an adjustable tension ring. Keys above the trackball provide left, right and middle click functionality. The DU-5K-TB is also ADA 508 compliant.