Product Features:
Working Based on existing GSM/GPRS network and GPS satellites, this product can locate and monitor any remote targets by SMS or internet.
Geo-fence: The unit will send the message to the authorized numbers when it breaches the district.
Movement alert: When the unit stays immobile in a place for 3-10 minutes,  then the unit will reply, it will send SMS "Move" along with a Geo-info to the authorized numbers. It will alarm one time in each setting.
Over speed alert:  When the target moves exceeding the speed you setting, the unit will send SMS +Geo-info to the authorized numbers.
Audio monitoring: You can dial into the GPS unit and simply listen to the sounds around the unit.
SOS function:  When holding the GPS Tracker you can press alarm button to send alert, and your position to the registered phone numbers..
Specifications:

Dim:  64mm x 46mm x 17mm (1.8”*2.5”*0.65”)
Weight:  50g
Network:  GSM/GPRS
Band:  850/1800/1900Mhz or 900/1800/1900Mhz or 850/900/1800/1900
GPS chip:  SIRF3 chip
GSM/GPRS module:  Siemens MC55 or Siemens MC56 or Simcom300 or Simcom340
GPS sensitivity:  -159dBm
GPS accuracy:  5m
Time To First Fix
Cold status:  45s
Warm status:  35s
Hot status:  1s
Car charger: 12―24V input, 5V output
Wall charger: 110－220V  input, 5V output
Battery: changeable 3.7V 800mAh Li-ion battery
Standby: 48hours
Storage Temp:  -40°C to +85°C
Operation Temp: -20°C to +55°C
Humidity: 5%--95% non-condensing
Package Content:
Mini GPS Tracking Device x 1
Rechargeable Li-ion Battery x 2
Battery Charger x 1
Power Adapter x1
Water-proof Bag x 1