I.R.I.S. IRISPen Express 6 for Windows - Manual (Page 43)

C HAPTER 5 - F REQUENT COMMANDS
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If the Sound option is enabled, you will also hear a beep sound
whenever an error occurs or if you try to operate wrongly with the
IRISPen.
To activate the beep sound:
• Click the Sound button
on the toolbar or select Sound from
the Options menu. The beep is activated. You can hear it during
scanning.