1. Functions
It provides the direct guardianship between the guardian and the guarded. The guardian can check and track the geographic location directly through SMS queries instead of any monitoring system, thus saving the monthly fee for that.	Low cell alarm
	Mode shifting
	SOS Emergency Alarm
	Server shifting
	Automatic time calibration
	Remote monitoring
2. Hardware
GSM frequence:	850/1900MHZ
Charging voltage:	110-220V
Working temperature:	-20o-〞65o
Humidity:	5%-95%
Limited working temperature:	-30～C -- -40～C,  +80～C-- +85～C
Storing temperature:	-45～C -- +90～C
Start-up time, hot start:	<1.5s   Warm start: <34s
Accurate positioning:	3.0 m 2D-RMS , DGPS: 2.5 m
Speed Positioning:	0.1m/s, DGPS:0.05m/s
Power consumption:	standby 48mA(Depending on the system network state and the user's operation method)
Charging port:	DC 5V 3A

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