Please check the invoice and delivery address. In particular, you should specify the billing address correctly. Please contact us immediately after purchase if you require changes to the address material. Unfortunately, we can no longer change the billing address after sending the invoice. You will receive the invoice on the day of shipping as a PDF by email. Unfortunately, we can no longer generate an invoice in paper form. 3. The guarantee refers to manufacturing and material defects of the delivered goods. The guarantee does not extend to any consequential damage. Warranty claims cannot be taken into account in the event of damage caused by improper treatment, self-made changes in the goods, non-observance of operating or care instructions, through force majeure or environmental influ.