A GPS vehicle tracking device is placed on your vehicle(s). The device can be permanently installed and hidden from view. Or, it could be a portable unit run off of an internal battery. As the vehicle drives, the vehicle tracking system will transmit its position back to any cellphone via GSM network. How It Works: EV-601 communicates to the host with the GSM dial tone. It is point to point (EV-601 directly to any phone via GSM network) solution and no need any call center or server in between. User just put any valid SIM card in and turn it on, one can start to track the object. Since it is point to point solution, users don’t have to pay any monthly fee or contract with the service provider. User just buys the unit from the store and use it and track it right way. The user privacy can also be protected. In this tracking system, it can stop engine/oil: send SMS to the system,the system will operate to cut off the power supply controlled by which . Send the message to the device then it answer you by send a message to ur mobie phone inform you by GPS method like: Date:xxxxxx Time:xxxxxx , lat:xxxxxxx, lot:xxxxxx, speed:xxxxxxx It can be connected with your car alarm system.Provide three sensors trigger signal input to upgrade your original Car Alarm system(like siren,shocking sensor, moving deteciting trigger, Ugent help trigger, ACC Trigger and Door Trigger), for example: when sb open your car door, the system will send a message to warn you. Coordinates-Saving function. when the device got no GPS signal, it will send the lastest coordinate to user. in the mean time, if user send F to this device when no GPS signal, it will send the SMS back to user once it gets the GPS signal. Over speed alert: This function use for the owner want to control the target's speed. Geo-fencing alert: Set up a geo-fence for the unit to restrict its movements within a district. The unit will send the message to the authorized numbers when it moves out of the district. Auto tracking by time intervals. External power lost alert function. Low Battery alert. Listen-in function. Show your location on cell phone via picture. With movement alert function. Customize user's name display for better management. With built-in lithium battery, can be charged by exterior 6 to 30V. with environment-friendly GPS, GSM antenna.