Before revision: Principle Early vehicle parking assistant products used ultrasonic proximity sensors or a single rear-view camera to view and obtain distances to objects surrounding the vehicle, providing drivers with an audible alarm or rear-view video through a fisheye lens.
After revision: Principle Early vehicle parking assistant products used ultrasonic parking sensors and/ or a single rear-view camera to view and obtain distances to objects surrounding the vehicle, providing drivers with an audible alarm or rear-view video through a fisheye lens.