Howard Miller 645-346 Discoverer Table Clock The revolving world map is accented with deep blue oceans and silver-tone continents and protected by a convex acrylic crystal. Polished silver-tone metal columns and base support the beveled arch. A felt bottom protects fine desks. Quartz, battery-operated, alarm movement includes one AA sized battery. Height 6.25" (16 cm) Width 6.25" (16 cm) Depth 1.75" (4 cm)