The Silent Smart Tag! This QR tag allows you to store all of your contact information on your pet's ID tag. Anyone who finds your pet can simply scan the QR code with their phone's camera to display your pets profile page. Need to update your contact information? No need for a new tag just login and change it 24/7. You set the privacy level via your login or the Petkey App. This tag provides the ultimate protection for your furbaby. • Large Circle: 1.25 inches • Small Circle: 1 inch