A:AnswerCameras are not wireless. Supplied cable needs to be run between cameras and DVR. Works better that way as my experience with wireless cameras was disappointing.
A:AnswerYes as long as they are BNC Connection, it should work, but you may have different power supply, to power connection. but that's it.
Thanks
Guy
A:AnswerNope it will record in a loop constantly erasing the old stuff. I think you get like 7 days of footage if you are using all 4 cameras. My system doesn't record when there is no motion at all so that really extends time it recording time off the hard disk.