What do the LED indicator lights mean on the tracker?
The Red LED stays on when charging and turns off when fully charged; it flashes fast when battery is low. The Green LED flashes quickly every second in GSM mode, flashes once every three seconds in GPRS mode, and stays solid on when there is no GSM reception. The Blue LED flashes quickly every second when GPS reception is good, and turns off when there is no GPS reception.
From the official Gps Tracker 303fg 2 V3 4 Gps Locator manual, page 7
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