The base of the security cameras installation is usually a recording device, whether or not provided with its own hard disc, and a web-server. This can be connected to 16 cameras which can be consulted selectively.
Depending on the environment, the recording image quality, whether visible or not mounted devices, there is a huge choice of different types of cameras. B / W or color, with or without built-in IR illuminator, zoom, pan-tilt, day-night, waterproof.
By default, images are displayed on the screen of an existing PC. But also a separate monitor or a TV set belong to the possibilities. One can watch real-time or recorded images from consulting the site itself or via the Internet on any computer.