This hard working Industrial 8CH Video Security System with a built-in 500GB HDD is a fantastic choice for any small business or home installation. Everything needed to install the security system is included in one convenient package and is pre-programmed to perform right out of the box but is packed with many user programmable options such as cameras views, recording rate, recording modes, motion detection, email alerts, remote access over the internet or smart phones, and much more. The DVR can be accessed using the included USB mouse, remote controller, via the front panel key pad, or over the network with most smart phones and internet browsers from anywhere in the world. In order to access the DVR, a user name and password is required. Once logged in, the administrator can add additional users and set up several levels of authorization for each user. Up to four remote users can log into the system at the same time. No need to worry, all the cameras will be recording. With the Quadplex feature, you can view live video, play back, record, and network simultaneously. The programmable features on the DVR can be modified remotely as well. The DVR can also be programmed to issue email alerts during alarm events and for system status. The included cameras terminate with a BNC connector and can be used in most video surveillance applications. The included 60 feet cable (one for each camera) has molded BNC and power connectors on each end. The enclosure is made of ruggedized steel delivering years of service and the low profile camera mount allows for a more discreet installation. Each camera has 24 Infrared LEDs that provide up to 45 feet of night vision and uses a CDS sensor as a light sensor to turn on the Infrared LEDs in low light conditions. Everything needed to install all four cameras included in one convenient package. Very easy to install -just plug and play but if help is needed just call our friendly technicians and they will be glad to help.