Is there a performance or feature difference between a Spotlight Cam Plus that is plugged in vs one that is hardwired? When you add the camera, the setup asks if it is powered by an electrical socket, battery or hardwired. I understand that battery powered is very different. But why ask for both plug-in and hardwired? Are they just over-simplifying the process for less sophisticated users or is there a functional difference? If there is a difference, what is it?