Unique illustrated Plays 12 popular North American bird songs A light sensor automatically reduces the volume of the melodies during the nighttime hours Quartz Taiwan sweep movement (Silent) Glass protects the white dial and Black hands 3 AA Batteries operated not included As the hour hand moves from hour to hour, you'll hear different bird songs every hour. White dial. A light sensor automatically reduces the volume of the melodies during the nighttime hours. Quartz movement includes battery. Dimension: 14" Depth: 2"