LASER ENGRAVED TIME TIDE & MOON PHASE slate CLOCK Gold coloured hands. Tall & skinny (12x30cm) TIDE CLOCK: shows the hours remaining until high & low tides. Smooth running, silent second hand. Most tide clocks work by using a 12 hour 25 minute cycle. Generally in the UK & Ireland they vary in accuracy between plus or minus 30 minutes over a 30-day period. Therefore it is necessary to reset them using local tide tables every month or so. Off-shore sand bars, inlets, shallow waterways and/or other factors may cause further inaccuracies to online predicted tide times. CLOCK: 12 hour design with smooth running second hand. MOON PHASE: Moon phase short hand takes 29.53 days to complete a full rotation. Red second hand rotates once every hour (not every minute) Quartz movements. Size: approx 12cm x 30cm See my how to set up your clock video by copying & pasting the following into google search. SADSAC DESIGNS - Tide time, moonphase clock trio set-up & fix Condition: New, unused. I make these to order then the mechanisms are tested & are working at time of posting. There may be slight differences to the pictures due to the natural nature of slate. I WILL SHIP WORLD-WIDE - I apologise for the extreme postal costs but they are based on what I have to pay. Wonderful gifts for that special person for birthdays, anniversaries, Christmas or just for a thank you for being in your life. Buy for someone else or treat yourself. Laser Engraved Time, Tide & Moon Phase Indoor Slate Wall Clock 12cm X 30cm