RF-links introduces the smallest tracking transmitter. It measures only: 0.3"x 0.55"x 0.25". It is the smallest tracking transmitter of it's kind. The range of this little unit is amazing - over 1 mile LOS or 5 miles from the AIR with a special receiver and high gain antenna. It is excellent for covert applications or experiments. This small transmitter is using VHF or UHF band. Almost any frequency is available thanks to a special PLL microprocessor circuit. This tracking transmitter has built-in special adjustable timer 0-5 minutes. Transmitter is fully crystal controlled with amazing frequency stability (.005%). The unit is using a 3 V battery with only 0.8 mA Stand by current consumption! The battery can last very long time!