When the QR code is lost, there will be no serial number. You need to contact us and provide us with the order number. The warranty time will need to be calculated from the order date.
How to get the Serial Number?
You can find the Serial Number in the Product Manual, and also you can find the QR Code. You can get the Serial Number fast auto-filled by scanning the QR Code with your smartphone.
How to get the Order Number?
If you buy the product from our Amazon store, you can get the order number that email from Amazon. If you buy the product from our website, you will get the order number from the email sent from our website.