via the manufacturer...
Num8 is the world’s first GPS locator device that has been specifically designed with children in mind. It tells you exactly where your child is, anytime — at home or even abroad. All you need is a mobile phone or a computer to find their precise location.
And unlike similar locator products, num8 has been cleverly concealed in a child’s digital watch that is securely fastened to your child and cannot be removed or deactivated without your knowledge. (more)
24-hour time?!?! Don't most kids have it hard enough comprehending the concept of 12-hour digital time?