Sino GPS Tracker (model: ST-903, ST-904, ST-905, ST-915 and ST-925) LED Indicator Light Status and its meaning
Yellow lightOn GPRS connection
Yellow light (Flashing)No GPRS signal
Blue lightOn GPS connection
Blue light (Flashing)No GPS signal
Red lightOn Tracker is Charging
Red light – OffTracker is not Charging
Sino GPS Tracker LED Status
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