Once a parent was looking for their 4 years old in panic with help of the police because the child for some reason decided to look for them outside of the house

Once a parent was looking for their 4 years old in panic with help of the police because the child for some reason decided to look for them outside of the house and ended up meeting some other children and went with them to the new playground, those parents look for something like a phone or something with GPS so they can find them earlier before something happens. Not every of those parents have the overview of which company can be trusted and which can't so they need to believe what the advertisement says.