A satellite tracking device that will allow parents to plot their child's location to within 10ft will go on sale in the UK in March, its manufacturer said.
Concerned parents will be able to receive text or email updates of their child's location.
Nu.M8, thought to be the world's first GPS locator device specifically designed to be worn by children, is concealed within a digital watch.
It can be securely fastened to a child's wrist and will trigger an alert if forcibly removed.
Parents who text "wru", or click "where r you" on the secure website, will be able to see the child's location on Google maps and the street address and postcode will also be displayed.
So-called "safe zones" can also be set up in which children can play safely and an alert will be sent to the parent's mobile phone and computer if the child strays out of that area.
The watch, which will go on sale in March, is expected to cost