Avision @V2800 - Manual (Page 80)

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Stamp If you wish to contain specific wordings as your stamp,
please enter text in this option for your scanned document.
(Note: In the Stamp field, there is a small “Soft Keyboard”
icon shown at the upper-right corner. Touch anywhere on
the Stamp field to bring up the soft keyboard to enter your
stamp characters.)
* Factory Default