A decentralized IP security camera has a built in recording function. A centralized IP security camera needs a NVR network video recorder program. The NVR program records images that are stored in a digital storage device. The digital storage device may be a SD memory card or a USB flash drive. A disk drive may also be a digital storage device. Professional grade Security CameraThe professional grade security camera has a detachable lens. The camera allows people to use it for different applications. For example, a standard security camera can cover a distance of 35 40 feet. Distances that are beyond 40 feet can be covered by the professional grade security camera. The professional grade security camera may have weatherproof housing as well. The best security camera system for home can protect your belongings.