Swann 8 Channel 720p HD Home Security DVR, 1TB HDD, Swann 4400 Series (Expand with Swann Pro-A850 Cameras) - SWDVR-84400H-US Model No. Swdvr-84400h-us State-of-the-art, Expandable Surveillance System 720p Hd Resolution 500gb Hard Drive Expandable To 8 Cameras With Swann Pro-a850 Cameras