Remote Tracking Device

I saw this gadget from a nice site. This gadget lets you track anything from children to pets and keep track of it wherever it goes. With a 90 meter maximum range, the intuitive design lets you track anything by direction (forward, left, right) and distance. Perfect for kids and pets on the playground, or moving items that you need to track.^.^ 

For extra security, the transmitter includes an SOS button that can be pushed to send an alarm to the remote control. But there's one thing that bothers me though.. What if the thing you're tracking is behind you?^.^ ???