A digital video color security system is a video camera based protection and monitoring component system. Although a bear-bones system may only require two separate devices to operate, it normally consists of three or more. At a minimum a color security system requires at least one camera and a Digital Video Recorder or DVR. However, if you want to be able to watch what your system is recording, you will also want to use the third component, a color monitor.
Talk about stretching the limits of technology, try a camera night vision helmet mount. These cameras may be custom created using a specific helmet, mount, camera, Digital Video Recorder or DVR, and battery pack, or may be purchased as one system or unit. The cameras are small and light enough in weight to be mounted to a helmet with other components attached on the user or the user's clothing or gear.
An autofocus CCTV or Closed Circuit Television camera is an ideal choice for surveillance and monitoring when the field of view encompasses large differences in distances of the target or the target is moving and often changes its distance to the camera. Most autofocus CCTV camera lenses are zoom lenses; a variation of this type of lens is a vari-focal lens which can vary its focal length by manual adjustment.