... GPRS data transmission 2Very clear satellite image view Auto Anti-theft and Vehicle Security SystemTracker MIC-GTK303I. Function ... arm/disarm, car searching, silently arm, Trunk release*Anti-hijacking:*Sensitivity of shock sensor adjustable*System power off ... receiving, sending, with TK301(SMS), 303GPS/SMS positioning anti-theft products, realize monitor positioning function. Have 900/1800 ...