Replace the date back battery when the data does not appear clearly on the picture. The date back uses (1) CR2025 3v lithium battery
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Remove the battery chamber cover by inserting a small thin object as shown
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With a piece of tape, take out the battery by pressing it down as illustrated
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Make sure that the "+" side faces out and insert the battery bottom first
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Replace the cover hinge securely and press down to close with a click. Place your finders and thumb as show to close the cover.
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