AVerMedia Technologies 500 - Manual (Page 28)

Chapter 3 Using the AVerKey500 Pro
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For example :
AVerMedia Spot-Zoom
As described earlier in the section, AVerMedia Spot, under Presentation
Highlight Functions, you can highlight a certain area in your presentation by
pressing the SPOT button.
After pressing the SPOT button, press ZOOM to enlarge the highlighted area
inside the colored frame. (The figure below shows an illustration.)
Press the SPOT button to Then, press the ZOOM button to
highlight an area. enlarge the highlighted area.
AVerMedia Pointer-Zoom
After you press the POINTER button to point on a key area in your
presentation screen, press the ZOOM button to magnify the area where you
are pointing to.