When the Child Safety Monitor is worn by a child, the cartoon animal-shaped transmitter sends a constant signal to the receiver, which is held by the adult. The signal is adjustable - from a distance of 6 to 30 feet, so when the child goes beyond the set distance, the adult's receiver starts to beep, letting them know that the child is starting to wander off. Frequencies adjust themselves automatically to alert the proper receiver if more than one adult is in the same area using the Child Guard monitoring system. Please note that this item may vary slightly from the featured photo.