... alarm, Anti-theft alarm, Power discarding, GPS antenna short circuit, GPS antenna open circuit, GPS receiver failure, illegal ignition ... internal, 12v, 500mAhBackup Time40minutes~90minutesSerial PortRS232Two ports, external intelligent devices such as cameras, PDA and other terminalsBaud ... temperature sensor, fix bar, and RS232 connected device Intelligent GPS car alarm system/gps tracking device/ car ...