Features:
GSM 850/900/1800/1900 Quad band
Wide for voltage input range: 9-36vDC
GPS continuous positioning， GPRS timing interval 
Check location via SMS 
Built-in vibration sensor， theft-proof
ACC ignition detection
Tele-cutoff (petrol/ electricity) function
Three SOS numbers in maximum
SOS alarm and burglar alarm
Voice monitor function
Alarm when the power supply is disconnected intentionally (with backup battery)
Compatible with external connection through (serial port)
Geo-fence via sms command 

Specifications:
GSM 850/900/1800/1900MHz
GPRS Class12
GSM antenna Built-in
GPS antenna Built-in GPS antenna
GPS Channels 12
Tracking sensitivity -159dBm
Acquisition sensitivity -144dBm
Locating time cost 
Hot start: < 2 sec(open sky)
Warm start: < 15 sec
Cold start: < 38 sec(open sky)
LED indicator Three LED indicator: GPS - Blue， GSM - Green， Power - Red
Battery 3.7V /450mAh
Monitoring range 10M
Standby time 60 hours
Operating temperature -25 Degree Centigrade to 60 Degree Centigrade
Humidity 5%--95% non-condensing
Size: approx. 8.8*4.5*1cm

Package includes:
1 x GPS Tracker
1 x Power cord
1 x Relay
1 x Microphone
1 x SOS alarm cable and button