Since the AVN80x is only a 5volt camera, you are limited to around 30-40 feet. If the camera will be farther than that, i would recommend testing the voltage drop and getting a power supply that will compensate for the drop. Also remember that the avn80x is a 2.5mm plug-in. So when you find a power supply, you may have to buy and adapter from 2.1 to 2.5.