If you really
are talking spycams
: that sounds like a standard resolution (higher get really pricey), but the subject/area
must be well-lit if you want a clear/sharp image. They can capture stuff in lower light as well, but the image quality degrades significantly. They also usually don't have much of a 'target area', unless you spring for a special lens.
I've done some camera installations in retail establishments, just in case you're thinking the worst...
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