Abstract: A system and method of tracking animal livestock using electronic frequency signal transmitters and receivers is herein presented. The system involves electronic tags attached to the bodies of livestock. The tags transmit a signal which conveys the location or other pertinent information regarding the status of the animal. The signals are picked up by a receiver attached to a stationary platform, or located in a vehicle, or in a portable hand held receiver device. The information transmitted can be used to locate a specific animal or can be used to monitor the status and condition of the animal. The device contains several modes which minimize power consumption and maximize power supply lifetime.