US Patent 7423538 Child alert system

A child alert system that uses radio transmitters and receivers to provide the location of a child, adult or object to which a transmitter unit of the system is attached. The transmitter unit includes a panic button for allowing the wearer of the transmitter unit to send a panic signal when they feel endangered. The system further includes signaling when the transmitter is submerged, when the vital signs of the wearer fall below a certain threshold, or when the transmitter is tampered or removed from the person.