... Engine, Door Open, Brake , 2x A/D (10bit digital,5V,12V,24V,30V optional) OutputsOil and electricity control, sound ... internal, 12v, 500mAhBackup Time40minutes~90minutesSerial PortRS232Two ports, external intelligent devices such as cameras, PDA and other terminalsBaud Rate51200bps ... /temperature sensor, fix bar, and RS232 connected device Intelligent GPS car alarm system/gps tracking device/ car gps ...