The Spy Tracker is the ultimate in spy gear for kids. Think of "hide and seek" times 10. With this high tech tracker kids can track movement nearly anywhere. Kids love pretending to be their favorite super agent. Now you can actually use some the same technology reserved for top secret agents. By hiding 3 motion sensors you can track movement on the mobile base station. Receives warning signals up to 75 feet away. Even through walls and doors. Now you'll get an alert by sector as you track the evil doers throughout the house or yard. Imagine knowing if someone is approaching your tree fort or bedroom. Now you'll know if danger lurks from anywhere. Is your mother coming? Oh no, it's your sister. Caught her red handed. Mission accomplished. Play high and seek with the Spy tracker and you may never get caught. Includes mobile tracking headquarters case with light up display, audible warning signals, and 3 remote motion sensors. 8 AAA batteries not included.