Abstract: A system for monitoring movement of a person. The system includes a mobile transmitter that is affixed to the person to be monitored. The transmitter transmits radio signals to a receiver that may be used to track the person. The receiver may include an indicator that shows when the receiver is proximate the person. The indicator changes intensity as the distance between the transmitter and receiver changes.

Abstract: A system for the monitoring of persons, in particular of children and of adults requiring supervision, comprise a portable transmitter, a receiver and a warning device provided at the receiver as well as means by which the warning device is caused to output a warning signal when the distance between the transmitter and the receiver exceeds a predetermined value, in particular an adjustable value, whereby additional means are provided at the transmitter for the voluntary transmission of a signal which causes the receiver to output a warning signal.

Abstract: The disclosed device is directed towards a system for the monitoring of persons, in particular of children and adults requiring supervision. The system comprises a portable transmitter, a receiver and a warning device provided at the receiver as well as means by which the warning device is caused to output a warning signal when the distance between the transmitter and the receiver exceeds a pre-determined adjustable value.