The is a belt buckle that can be attached and detached from the belt. It has a slot in it for an airtag to fit in. This is inspired because my grandfather has dementia and gets lost sometimes. We can track him with his phone or apple watch, but he is quick to forget these things at the house. However, he never forgets his belt that he wears almost every day. In the pictures, the black piece is a model of an airtag, printed to specs. The two bars that hold the tag in place are flexible.
The author hasn't provided the model origin yet.