... Track by SMS/GPRS on position platform 4.Multifunctional GPS tracker gps positioning systemMode H04 is the basic ... service,freight transport,air service,emergency,customs search for smuggle, leasing of tax and bus.,and so ... in the unit, when it connects, you can monitor the sound around 5 meter. 5. Movement Alert: ... . Geo-fence: Set up a geo-fence for the unit to restrict its movements within a district ...