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. This is not as difficult a hurdle though as having to run wires through walls. Summary Using a wireless security camera system with a DVR is a good option when adding wires is not an option. Keep in mind wireless doesn’t perform well in some cases and degrades with distance and barriers. One way to get a rough idea how well a system will work is to use a smartphone or tablet to stream YouTube videos and walk around to spots the camera will be located at. While there is different WiFi technology being used for each device it can give a general idea how well wireless will stream to a location.