Bushnell Imageview

What are VGA cameras?

I'm looking into buying one of those binocular camera and on some of them they'll tell me their 2.1 mp or whatever and on others they'll tell me they have VGA cameras. Here's the one i was looking at.
Thanks for the help!
http://www.opticsplanet.net/bushnell-imageview-binocular-111026.html

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