I installed the Voyager 7" wireless backup camera this weekend. I was nervous about drilling a hole in the back to run the wiring. I saw a couple of these at the rally so I followed their lead. I went in the middle of the marker light found hot and ground hooked up to the marker light and sealed everything up. Lights have to be on to work, but everything works great. All the reviews about wireless seemed so so, but I ran down the road with it on for 50 miles and no problem. The one I have also has sound so when the wife was in the back of the rig I could hear her talking to me.