Everything was included to attach the child seat using Isofix. The prerequisite is that your vehicle is compatible. This can be checked on the manufacturer's website: https://de.recaro-cs.com/kindersitze/105-cm/zero-1-elite-i-size.html

We still get this model very cheaply from the supplier. However, we get the other models from another supplier who also declares different prices. That is why the difference has arisen.

Yes, this seat can be used backwards up to 18 kg.