There is a much larger market for this tech - parents. Today's world is so crowded, kids or parents can be separated by less than 20 feet and devolve into panic. Give them each a way to know they're safe and can be found. You're already awesome, wish more people could share like you have, magnificent designs!
Also they're frequently arrested, and if their "belongings" are unsafe (biologically contaminated, disgusting) they'll be discarded or ignored by police, if the person hasn't seen the police coming and thrown their belongings aside in the hopes of coming back for them later. Sad all around.