X-Wave brand clocks are designed with large, high-visibility faces for easy viewing from a distance, with designs perfect for use in classrooms, offices, hallways, gyms, or cafeterias. Choose from traditional analog or digital designs with automatic adjusting or quartz manual adjustment. Auto-adjustment happens through a radio signal that the X-Wave clock catches several times daily to keep the clock accurate. All clocks are wireless, and batteries are required. Choose from standard wall-mounted clocks with a 14-inch or a large 16-inch overall diameter, with standard or military time faces. 16-inch diameter clocks are also available with a wall-mounted bracket to make the clock double-faced for hallway environments.