... system kind of sensor RS3000B1 is one kind of intelligent GPS two way car security system/car alarm system ... internal, 12v, 500mAhBackup Time40minutes~90minutesSerial PortRS232Two ports, external intelligent devices such as cameras, PDA and other terminalsBaud Rate51200bps ... level/temperature sensor, fix bar, and RS232 connected device Intelligent GPS car alarm system/gps tracking device/ car gps ...