This clever clock is perfect for those who enjoy coastal living or yearn for the salty sea air. Depicting a tiny mechanical harbour with moving waves and bobbing boats, the clock will help you plan walks on the beach at low tide or chilly swims at high-water. An incredibly unique addition to your home - get ready for compliments! With an electro-mechanical tidal timer inside, you can watch the waves move and the light house flash as the clever mechanical scenery brings the little harbour to life. The scenery updates every 30 minutes to keep track of the average moving tide. Like all Tide Clocks, it is set to work on a semi-diurnal timer of 12 hours 25 minutes and 15 seconds between high tides. Delightfully uncomplicated set up – synchronise the clock when your local tide is highest, and the semi-diurnal timer will do the rest, tracking the tides without needing an internet connection. Easy to hang, following the hanging guide that is included, and requires just a single screw in the wall. This clock is for indoor use only – and please don't hang it within 50cm (20 inches) of a radiator. Runs on regular batteries (included, of course).