AVer M11-8MV Manuel D'instructions page 20

Annotation
In single image playback mode, user can use the annotation feature to overlay
straight line or freeform line on the captured image with the USB mouse
connected to the USB port of M11-8MV.
[Note] Annotation function is not supported with video file.
1. Connect the mouse to USB port of M11-8MV.
2. Press to call out OSD menu.
3. Select "Playback".
4. Select the image and playback tool bar is displayed. Or right-click mouse to
call out playback tool bar.
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