A:AnswerYes you can live zoom. I just spin the wheel on the mouse back and forth. Make sure you zoom all the way out before leaving that particular camera or else you won't be able to click that camera to full screen.
A:AnswerMAKE SURE YOU HAVE DVR SET UP IN A COOL DRY PLACE WITH PLENTY OF VENTILATION . YOU MAY BE PUTTING UNDUE STRAIN ON YOUR DVR UNIT IF IT IS OVERHEATING. i HAVE MINE SET UP THE SAME AS YOURS AND THERE IS NO DISCERNERABLE HUMMING OR NOISE COMING FROM MY UNIT...THE NOISE YOU DESCIBE IS USUALLY CAUSED BY AN OVERHEATING OR FAILING HARD DRIVE...HOPE THIS HELPS
A:AnswerNo, they come with a 60ft wire that has the regular coax and a power for each camera. If you need longer distance than that they sell a longer cable too.