GPS car alarm system/gps tracking device,car gps alarm tracker 4 band GSM compatible with original ... , 12v, 500mAhBackup Time40minutes~90minutesSerial PortRS232Two ports, external intelligent devices such as cameras, PDA and other terminalsBaud Rate51200bps at ... fix bar, and RS232 connected device Intelligent GPS car alarm system/gps tracking device/ car gps alarm tracker RS3000B1/C1,support TF card ...