1. GPS tracker for car/truck/bus 2. free software access 3. support 2 gsm sim card 4. ... A-GPS, when tracker in underground or tunnel ,can get location by ACPS. Real time tracking Real time tracking it by cell phone ... t car move, the device will be wake up to tracking the car, and send the data to cell phone ... be keeped 3-5 months. Vehicle Car micro gps transmitter tracker with free tracking system