Very disappointed with this purchase. I ordered 2 copies. I have successively lost two on the road! One tip, if you're driving along, for your 3000 km ordering an entire crate ... Furthermore, due to the presence of composite materials, the disc "glue" not on some AR parts of certain vehicles. So the second tip: check that a metal part is in the back of your vehicle! Third tip: Order a single copy, and test. Last tip: Buy an adhesive! It's quicker and safer! This is what I did ...