Osoto NV-1920 - Manual (Page 13)

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Storage:
Pressing button can store present image.（Note: when it
fulfills with images, indicator will be off, if users want to store more,
please delete previous storage for 1 set and can store 1 set
again）
●Rotation：
Pressing button can rotate the image 180°.
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Select image:
When it is in the state of split screen, pressing
button can recycle or delete images. Press one second for
next image
●
Recycle:
Pressing button can recycle selected images.
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Delete image:
When it is in the state of split screen, pressing button
can delete selected images. Press one second for
deleting stored images.