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A power supply for just about every electronic device on the market. Also called an "AC adapter" or a "charger" if used to recharge a battery, it plugs into the wall and converts A [..]

Some DVRs have alarm inputs which can accept input from a sensor device such as a door contact or a motion detection device. These can trigger the DVR to take action by beginning to record when they h [..]

CCTV cameras that transmit video using coaxial cables are considered to be analog.

The angular range that you can focus the camera without distorting the image. Smaller focal lengths will give a wider angle of view.

The opening of the lens which controls how much light can enter the camera.

The ratio of the width to the height of an image or screen.

A lens which allows the opening of the lens to automatically open or close to maintain proper light levels

A lens which allows the opening of the lens to automatically open or close to maintain proper light levels

The gain of a signal is automatically adjusted with this feature.