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Press and hold the Power button and click the Freeze
button to turn on/off the two LED lights simultaneously
(The operation is compatible for all firmware version)
Press and hold the Power button and press the Focus
Control button to switch from 3 lighting statuses: Left
light on, Right light on and All lights on/off (based on the
latest setting).
Focus Control
Click the Focus Control button to lock the focus,
which is especially useful when handwriting.
Click the button again to unlock the focus.
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