How It Works:
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.

It main features as below:
1: Real time tracking by SMS or GPRS.
2: GSM/GPRS simultaneously.
3: Auto Tracking by time interval (via SMS).
4: Show location directly on cellphone.
5: Unit password setting.
6: External power lost alarm.
7: Back-up battery low alarm.
8: Geo-fencing alarm.
9: Over speed alarm.
10: Coordinate saving.
11: Movement alarm.
12: Voice wiretapping.
13: Stop Engine/Oil.
14: User defined by SMS.
15: I/O ports trigger alarm.
16: Data Logger Capability.
17: Firmware Upgrade over the air.
18: With Bulit-in lithium, can be charged by exterior 6 to 30V DC

Specifications:
GSM frequencies: 850/900/1800/1900MHz
GPS chip: SiRF Star III
GPS sensitivity: -154dBm
GPS accuracy: 5 to 10m
Time to first fix: Cold status 60s
Warm status: 40s
Hot status: 1s
Input voltage: 6 to 30V DC
Battery chargeable: 3.7V, 1300mAh
Standby time: 24 hours
Static current: 20mAh
Storage temperature: -40 to 85C
Operating temperature: -20 to85C
Humidity: 5 to 95 RH (non-condensing)
Mainframe dimensions: 106x22x 63mm
Weight: 600g.