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If you let the size of these tiny spy cameras fool you into dismissing their functionality, then congratulations: in a way, you've just demonstrated their effectiveness.
After all, it's much easier to swap out a power cable than a regularly handled object such as a DVD player or alarm clock.
If you see a 1280x960 HD camera advertised don't buy one by mistake, they aren't HD and are only 640x480 upscaled.