http://www.supercircuits.com/Camera-Power-Supplies/ - The security camera power supply is one of the most important things you need to think about when buying a new camera. The camera power supply will determine where you can actually place your camera. A CCTV camera power supply is almost always wired, although some wireless versions are now starting to be developed. Therefore, you are unable to place the camera too far away from the source of the security camera power supply.