I have seen license plate frame sensors that work with your smartphone and are wireless.
https://fensens.com/products/fensens...parking-sensor
https://www.hammacher.com/Product/91...CABEgK-F_D_BwE
The downside to such systems is that they are not automatic because the system is not wired to your vehicle. So, you would need to launch the app before you back into a parking spot. And, there's no camera. However, you could add a smart mirror with camera as an adjunct with the parking sensors. There are wireless cameras on the market that integrate with smartphone, too. If you're choosing between the two, a camera with depth lines and the audio prompts of the parking sensors, it may be personal preference, but both can be accomplished in a wireless setup, though perhaps not as automatic as a fully integrated and wired system.
I'd also check with a local shop that does replacement head units to see if you can get one installed with the monitor in dash in the car that you're considering, then you could add the wireless audio prompts of the park sensors.
Both the camera and sensors can be incredibly useful when parking in dense urban environments. And, before anyone chimes in with using their eyes, mirrors, and turning your head, I do all three, but the camera and sensors aid greatly, which I find very helpful when parking in DC and NYC.
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