The Trident Time and Tide is a combination time and tide clock movement which averages the Atlantic lunar tide cycle Tide sector is calibrated for the east coast of the United States. The Trident is an easy-to-read tide and time wall clock featuring a matte black case with red, white, and black dial graphics and a flat acrylic cover. The dial features Arabic numerals and white hands. A red tide hand indicates the approximate tides for the Atlantic Ocean. Accurate quartz movement operates on 1 AA battery. (Note: The clock will work for other tidal bodies of water but will need to be re-set more frequently.