You can find more information on the subject in the following video: https://www.youtube.com/watch?v=5SdOyYdv10w.

It is fixed with the three-point belt. It is looped in on one side and out on the other. The belt is then inserted into the belt buckle in the normal way.

Hello, yes we use the 5 point harness. But we bought the seat mainly for holidays (transport in the plane and own weight very small). But we are very satisfied with the product.

It does not yet have a TCS rating.

Unfortunately, this information is not provided by the manufacturer.