Your surveillance system may not be that much necessarily your specialty if you are like the owners of small business. You know it is important to have one Hidden Camera; you may also have any experience that may convince you. You may not know where to go in next step after buying the security cameras. The most important detail that is to be noted in any security system it that to bring more unity with the one piece of equipment. It is sure that the cameras are key which allows viewing multiple shots simultaneously and also recording of everything on screen at the moment can be made by the security systems like DVR, or the multiplexer, or the quad. Those options depend on selecting any one of those you need. There is also difference among those items and the basic functions of them seems to be the same. By making use of the surveillance camera the video are captured and the signals are sent to the monitor to view and allow recording. The next process steps depend on the model you select in particular. Among those three mentioned quad seems to be the simplest. It receives the signal from all the cameras and send signal for the display of one at a time. It has many advantages and seems to be the best.