Here we briefly explain bullets, domes, turrets, wireless and wired cameras.
Cloud back-up refers to remote storage of recordings (video footage) from the cameras. This can be helpful in the event the recorder is stolen.
This is a simple comparison of different types of camera resolutions and what they would look like when viewing the footage.
This is a nice simple comparison of focal length "sensors" vx. field of view.
This is a quick tutorial of port forwarding if it is ever needed.