I would like to sell my Air one flex, invoice date 27.05.2021, gladly for 800 euros including insured shipping. The device works perfectly and since it is just under 2 months old, it has accordingly also still manufacturer warranty. The original invoice is included.
On the invoice is still Ectoin included, which I had bought additionally. This is not included. The manual including video and explanations of the device can be found on the page of Hippomed.