What is a QR code and why do we use it on our collar tags?

QR code (abbreviated from Quick Response Code) is the trademark for a type of two-dimensional barcode.
A barcode is a machine-readable optical label that contains information about the item to which it is attached.
A QR code uses four standardized encoding modes store data.
Source: https://en.wikipedia.org/wiki/QR-Code

Because the QR code is errors resistant we use it on our collar tags. The code contains the chip number with a link.
Not everyone has a special RFID reader but many have a smartphone with a QR reade app. So nearly everyone can identify you as the pet owner.
The collar tag does NOT replace the microchip, it is a useful addition to it. Please remember to register the chip number e.g. at Tasso!