The LD9000 is a sleek single-sided display, while the LD9000X is a stylish double-sided display (each side can display the same or different messages). 9.5mm character height Bright blue-green fluorescent display Two-line display with 20 characters per line Automatic smart message scrolling Matched optical lens for better viewing contrast Ergonomic design Adjustable rotation and tilt angles Offset mounting and pole height options.