... gps tracking device,car gps alarm tracker 4 band GSM compatible with original lock system kind of ... General Specification Measurement102x68x42mm 550 grams Cellular ModemGSM dual band or quad band Cellular AntennaDipole ExternalNetworkDataGSM, GPRS and SMSVoiceHeadset Kit ... , Anti-theft alarm, Power discarding, GPS antenna short circuit, GPS antenna open circuit, GPS receiver failure, illegal ignition ...