Spy Lab: Location TrackerIf you're raising a future James Bond, your young secret agent needs the high tech help of a location tracker. Hide the transmitter with a valuable object or plant it on a suspect, then use the hand held detector to track its whereabouts with ultrasonic sensors. The LED on the detector lights up as you get closer to the transmitter. Great practice for super sleuthers, and a fun way to elevate the stakes of hide and seek or scavenger hunts! Requires 2