Re: Ye Gods!
I don't think it would be aimed at kids who are at an age or temperament that they get up to no good, it would be aimed at kids that are still young enough to not want to go missing. Therefore they would feel happy about wearing it and might get some extra freedoms like being able to walk home on their own from school or with friends without their parent having a nervous breakdown.
It would also mean that a phone does not to be purchased for the child at an age where the parent would prefer them not to be glued to a smartphone but would like the convenience of being able to be contacted if they are needed.
I could see the use case for my 8 yo daughter but it would not be something for my 13 yo son!