xmartO WOS1388 1TB 8 Channel 960p HD Wireless Security Camera System with 8 HD Outdoor Wireless IP Cameras and 1TB Hard Drive Auto Pair, Built in Router, 1. 3MP CameraThis large 8 camera system with a 1TB DVR is built to give a lot of coverage. As with other systems the cameras can be viewed on a monitor and with a app. The hardest part of a large wireless system such as this is plugging in all the cameras. Each camera will have a 12V DC adapter that plugs into a 120 volt AC wall outlet. How the power is run to each unit will need to be given some thought.