900MHZ Data Logger Vehicle GPS Tracking Systems With SOS , Monitor

900MHZ Data Logger Vehicle GPS Tracking Systems With SOS , Monitor Main Features: ● Based international newest chip, double core structure, powerful ● GPRS and SMS double channels, TCP and UDP double working mode ● Positioning based GPS reflected wave, assist with base station, strong capacity to prevent blocking to reduce the blind area ●Three proofing design, Quadruple protection for power source, 4 levels watchdog ● Low power consumption, ● Build-in high capacity backup