Citizen bl5380-58e User Guide

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Ensuring optimal operation of the watch
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Always store the watch in a bright location for best results.
When you take your watch off, place it in a location so that the  dial (face) can receive 
light, such as a window sill, where sunlight can directly strike the watch  dial (face).
Wearing clothes with long sleeves may inhibit sufficient light from reaching the watch 
dial (face), resulting in insufficient charging.
It is recommended that the watch is charged in direct sunlight once a month for 5 to 6 
hours.
[Charging precautions]
Avoid charging the watch on a car dashboard or under other high temperature 
conditions (60°C/140°F or more) as this may result in damage to your watch.
Avoid charging the watch under potentially high temperature light sources such as 
incandescent or halogen lights as this may result in damage to your watch.
Periodically expose the watch dial to daylight
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This watch uses a rechargeable cell to store electrical energy. This is an environmentally 
clean cell that does not use any harmful substances such as mercury.
Once the rechargeable cell is fully charged, (and the power saving feature is operative) 
the watch will function for approximately 8 months without additional exposure to light.
Guide to Charging Time
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Most users find that their watch receives more than enough light to keep it charged 
through their normal daily routine.
During normal operation, the charge necessary for the watch to operate for one day can 
be obtained in approximately 10 minutes per day when charged outdoors in direct 
sunlight, and in 4 hours per day when charged by indoor illumination. 
If your watch is not exposed to light regularly and to prevent the watch from stopping 
due to an insufficient charge, we recommend that you charge the watch for 5 to 6 hours 
under direct sunlight once a month.