... OInputsEmergency Button, 2xLow Level Voltage, 2xHigh Level, ACC, Engine, Door Open, Brake , 2x A/D (10bit digital,5V,12V ... GPS receiver failure, illegal ignition, illegal door-opening, Voltage Analog Input, Low battery voltage alarm, emergency brake, etc.Backup Battery ... monitor, fuel level/temperature sensor, fix bar, and RS232 connected device Intelligent GPS car alarm system/gps tracking device/ ...