the first one,real four frequency GSM/AGPS universal tracking device
2. AGPS/GPRS track,location SMS including longitude, latitude and address information.also have maps site URL
3. can be switch language,chinese/enghish
4. double power supply system, which can external DC12-24V , never power off (Suitable for vehicle and valuables anti-theft tracking)
5.remote contral, easy to opration
6. Vibration sensor alarm
7. voice sensor alarm
8. many Alarm mode can be choose
9. SOS function
10. headphone talk
11. GSM bug function
12. Remote network signal/battery/alarm status check
13. Low battery remind
14. Can set alarm interval
15. frequency: 850/900/1800/1900MHZ
16. size:55*35*13.5mm weight:34g