Casio GB-6900B User's Manual For Watch Functions page 48

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◆ Auto Light Precautions
Leaving auto light enabled can run down the watch's battery due to frequent
display illumination.
The auto light may not operate properly when the watch is angled towards your
face from an angle greater than about 15 degrees as shown in the illustration
below.
Electro-static charge or magnetism can interfere with proper auto
light operation. If this happens, try lowering your arm and then
angle it towards your face again.
When moving the watch you may note a slight rattling sound.
This is due to operation of the auto light switch, which determines
the current orientation of the watch. It does not indicate
malfunction.
Auto light will remain enabled for about 6 hours after you turn
it on.
E-47

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