When I ordered my car, i paid for rear parking sensors but these were not available at the time. Last week they had arrived at Renault London and yesterday they were fitted.
No suprises, they work nicely.
Place the car in reverse… the sensors bleep once to show they are active.
If something is generally behind they will multi-bleep and as you move to within 12 inches or so of an obstruction you get a solid bleep.
No pics as nothing is visible!