It does its job. Only 3 stars just for the image. It is not HD. It looks decent but it has some lines. In today's era, I cannot accept it not being Full HD. So I was disappointed by that alone. It does its job as a camera, of course. You can see behind. And at night with difficulty. But when you get close to the obstacle, you can see something.
As for the sensor, I don't know if it works. I have it installed on a rural vehicle and the license plate is embedded. So the sensor constantly hits the bodywork. I can say that its speaker is very loud. So I removed the sensors myself.
Overall, I think this particular device is not worth it as a purchase, neither in terms of price nor quality. There are definitely better and cheaper options.
I thought about it because I only wanted a camera. It would have been nice to have sensors as well, but it wasn't a good idea in the end!