Don't buy an uber cheap camera, the resolution is absolute crap.
I actually recently downgraded from the Logi Orbit MP robotic camera and the picture quality was amazing on that thing. The one I replaced it with, the Logi QuickCam STX, has no where near the image quality that the Orbit did.
Just my 2 cents, but try and invest in a decent camera if you wan't to actually be able to tell when your bike is getting stolen
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