- 8 -Nino® user manual2. Serial number/warranty certificateThe warranty certificate contains the details of the guaranteed items, the information necessary for accessing maintenance service and orderingaccessories, the effective warranty date signed by your retailer, the contact information of the latter, and his/her stamp.Furthermore, a label with a unique serial number is affixed to the first page of your warranty certificate.The serial number is a combination of 14 numbers and letters that you can find:Ø on the first page of the warranty certificate;Ø on the part that supports the battery on the base of the main structure;Ø on the outer side of the packaging.