This time and tide clock is a perfect choice for mariners as it is an “easy-to-read” device. The combined movement of time and tide averages the Atlantic lunar tide cyle. The tide sector calibrated for the east coast of the United States with the dial showing Arabic numerals makes it unique. This flawless timepiece is very informative and helpful. Product Features: Features large black dial with easy-to-read bold white lettings Illustrates a black resin case with acrylic crystal Comes with tide indicator hand calibrated to the Atlantic lunar tide cycle Requires 1 “AA” battery (included) Recommended for indoor use only Made in Canada Dimensions: 4″H x 12″W x 2.75″D Material(s): resin Note: the clock will work for other tidal bodies of water but will need to be re-set more frequently