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Features:
1.GPS+BD+LBS+WiFi four mode positioning
Device supports GPS+BD+LBS+WiFi positioning, GPS/BD is mainly for outdoor positioning and LBS/WiFi is manly for indoor position.
2. Geofence
After the Geofence is setup, you will get alert notice when the cars/kids are out of the range of the setup circle, which will secure the kids' safety and keep you a peace of mind.
3.SOS call
With SOS button(power on button)and two way voice function, the kids or seniors can press the SOS button for help and talk with the host when they are in emergency. 
4.Historical route
The device will keep a record of the historical route for three months, user can check the records on smartphone
Structure parts
Size: 40(d)X12mm
Color: black, white, red 
Button: one button(power button and SOS button)
GPS antenna: built-in high sensitivity ceramic antenna
GSM antenna: FPC
Battery: 400mAh
SIM card slot: one slot
G-sensor: supported
I/O port: magnetic suction charging
Waterproof level: IP54
Hardware parts
Chipset: MTK2503
GPRS: class 12
GPS: signals L1,1575.42MHz C/A code
GPS channels: 22 channels
GPS chip receiving sensitivity:
Tracking sensitivity: -165dBm
Acquisition sensitivity: -148dBm
GPS positioning accuracy: 5-15m
Accuracy base station location: 100-1000m
Minimum standby current: <0.5mA
Average standby current: <2.5mA
Average working current: <55mA
Temperature: -20 to 70°C
Humidity: 5% to 95% no condensation
Certifications: can pass FCC,3C and CE
GPS antenna: built-in high sensitivity ceramic antenna
GSM antenna: built-in four frequency PIFA antenna
G-sensor: compatible
MIC: supported
Software parts:
Supported system: Android 2.3 and above, iOS 5.0 and above
Familiarity number: supports familiarity number automatic answering, two-way conversation
Language support: 10 different languages
GSM + GPRS + GPS+ WiFi + BD: GPS + LBS + BD + WiFi
AGPS: supported, positioning after 26 seconds cool start
Call function: interference-free mode, familiarity
Number force feed, monitoring ambient
Battery management: ultra-low power consumption of power management, smart stay