GSM module: SIMCOM 900D GPS module: HOLUX M-89 Real Time Internet Based Vehicle Tracking Working method: Locate by GPS send back the location by GSM Only work for the GSM network country when the car stop over 2 minutes or the ACC turn off , upload will stop Can' t work in the room or under ground park or other indoor place that has GSM signal The service charge is SMS charge and GPRS charge the longitude latitude and display the location of object on the map or satellite map Upload IP address can be set by SMS APN name can be set by SMS Device serial ID can be check by SMS Monitor function Calling preset phone number keep 3 months history track on server Can preset 2 phone number by SMS Tracking on demand. Tracking per time intervals. Storage when there is no coverage It supports GPRS/ SMS communication Standard tracking in real time through: unit PIN, location, speed, time, direction, alarm status Automatic time reports, or through commands. SOS function SOS & alarm information can also send to platform Geo Force function Send alert of over speed to the preset phone when it exceeds the restricted speed Cut off engine by SMS and platform Cut off the oil by SMS and platform