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11. Solar Power Function
This watch uses a secondary battery to store electrical energy.
Once the watch has been fully charged, it will maintain its accuracy for about 8 months
when operating normally (when not in the power saving mode). In the power saving
mode, it will maintain its accuracy for about 2 year.
<Ensuring best operation of the watch>
Keep the watch regularly charged for best results. Charge watch by exposing the watch
face (which contains the solar cell) to direct sunlight or to a uorescent lighting.
<Regularly charge the watch>
Wearing clothes with long sleeves makes it dif cult for the watch to get the necessary
light, resulting in insuf cient charging. Be particularly aware of the need for regular
charging during the winter.
Placing the watch near a window where its face can receive sunlight or near another
source of light when you are not wearing it will ensure that the watch is regularly
charged, allowing it to maintain the correct time.
4. Determining square root
Example: What is the square root of 225?
Solution: Rotate the scales so that the value on the inside scale corresponding
to 22.5 on the outside scale is equal to the value on the outside scale
corresponding to 10 on the inside scale, and read off the answer of
15 at that location.
30


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