Little kids need guardians. When we lived in villages, near extended families and long-term neighbors, the community could help keep an eye on them. Even growing up in New York City in the 1970s, I remember a network of neighbors and friends on my block looking out for me.
But that seems to be less and less the case now, in 2018, so we have technology. Kid trackers act as a friendly ghost over a small child’s shoulder, alerting their parents to when they’ve gone missing. They can also be communications training wheels, letting kids chat with their parents if the school bus doesn’t show up or if they get left behind.