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An electronic tracking device (also called a transponder) is a one-way radio communication device that emits a signal on a specific radio frequency. This signal can be received by special tracking equipment, and allows the user to track the geographical location of the transponder.
Such "homing" devices are used by law enforcement personnel to keep track of the physical whereabouts of the sending unit, which might be placed in an automobile, on a person, or in some other item.