There are many different kinds of security system; each one for a different application. What is the best choice for your home may depend on what it is made of and where it is sited. Wireless security systems are good for where it is difficult to install cabling, however both concrete and high tension power wires can interfere with the signal.
Some security systems only work when the break-in has been accomplished and are more about alerting security staff or police and identifying the criminals. They may make use of an infrared camera or some other kind of surveillance camera for this purpose.
But for a homeowner who is interested in preventing a break-in and worried about opening the door to a stranger, a closed circuit monitoring system (CCTV) could be the answer. There is no need to open a door without first knowing who is on the other side with a CCTV camera installed. You can also add automatic lock controls and an intercom for extra protection.
Dvr stand-alone security camera systems provide simultaneous recording and playback capabilities. These security camera systems have certain benefits, but they are not suitable for all needs. Usually at least one camera is needed as a minimum while you also need something, such as a TV or a monitor, to play back the images on. If you want to use your TV then it will need to have ‘video in’ jacks. If you want to record images you will need a VCR.
When choosing a CCTV dvr unit you can get a black and white or colour camera, but the correct camera lens is of prime importance. An auto-iris lens is a good general one used for varying light conditions. Manual and power zoon lenses are also available.
While you may feel that multiple cameras are necessary to watch each entry or exit area, having more than one camera means that your security system will be more complex. It does not need to run continuously, though. It can be set to only start when motion is detected.