This traditional Time & Tide Clock has a black dial with easy to read bold white lettering. It is housed in a black case with acrylic crystal. The combination quartz clock and tide clock movements are AA battery operated. The tide sector is calibrated for the east coast of the United States and averages the Atlantic lunar tide cycle. (Note: The clock will work for other tidal bodies of water but will need to be re-set more frequently.) Dial: 10-1/4 . Base: 10-1/2 . Depth: 2-3/4 .