Black color Modern Contemporary Mechanical Gear Wall Clock with Calendar Wheel Month wheel rotate manually once a month. Date and time rotate automatically. All gears are made of plastic and the main unit is made of steel. Several small gears are running nonstop 24 hours a day to initiate the movement of the outer big gear. It shows time at the default "12 clock" position. Read the date and month on the 2 little wheels on the center and the time on the large 22 inches wheel. Good quality with marvelous design which delight your home & office.