... memory,support TF RS3000 is a multifunctional GSM/GPRS GPS car tracker,car alarm system to monitor various vehicle sensors with ... , GPS antenna shourt circuit, GPS antenna open circuit, GPS receiver failure, illegal ignition, illegal door-opening, Voltage Analog Input, ... sent in one message, thus reducing the communication costs.GPRS Economic Mode Working in economic mode,RS3000B1 auto-report ...