ViewSonic VS13339VS13340 User Manual page 60

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3. If the battery light does not turn on when the pen is being charged, try one of the
following:
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56 Operation
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Make sure the projector is displaying the same image as the computer's main or
built-in monitor (don't extend your desktop into multiple monitors.)
Make sure a USB cable is connected between the pen and your computer. And
your computer is powered on.