BlueTag
TaskBlue's NFC tag. One scan ends any running focus, and it is how your child's iPhone signs in to TaskBlue.
The BlueTag is a small tag with an NFC chip, printed in Berlin from plant-based PLA. It needs no battery. One scan signs your child's iPhone in to TaskBlue, no email address needed. After that, a scan ends any running focus, whether it was started by hand, by schedule, by calendar or at a place. The BlueTag cannot start a focus.