Another vote for "real" wireless. The original wired system on my 2016 Promaster died and it was impossible to figure out why since all the wiring was buried behind walls and insulation. A lot of the "wireless" systems actually require power for the camera, usually from the backup light. This is probably pretty easy to arrange in a car with a trunk, but in the Promaster it was impossible. The Foxpark camera has an internal battery so there is truly no wire to the camera and it supposedly uses solar to charge it. I can't swear that is true, but the monitor on the dash (which connects to the cigarette lighter outlet) has not shown any battery drain in about a month. The FoxPark does not connect in any way to the reverse gear (or backup light). Instead, it comes on for 90 seconds every time you start the van, and there's a button you press if you need another 90 seconds. By the way, the display is beautiful, although it doesn't have the nice lines that show the turn radius and curbs like a modern car. But I'm really only interested in making sure there are no objects (or children) hiding in the blind spots between what the side mirrors can let me see, so I'm happy..
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