Keyboard with Integrated Trackball The new DBL-810-TB is constructed using a highly rugged, stainless steel case and industrial silicone rubber pad. The DBL-810-TB’s trackball pointing device is a completely sealed 25-mm unit. The trackball is operated using sealed stainless steel switches with left, right and middle click functions. The DBL-810-TB features integrated green LED backlighting for use in low-light environments, and is sealed to NEMA 4X specifications. - Integrated Backlighting - Integrated Trackball