... 4 band GSM compatible with original lock system kind of sensor RS3000B1 is one kind of intelligent GPS two way car ... ,1575.42MHZI/OInputsEmergency Button, 2xLow Level Voltage, 2xHigh Level, ACC, Engine, Door Open, Brake , 2x A/D (10bit digital,5V,12V ... , Mic, speaker, buzzer, siren, camera, handset/LCD monitor, fuel level/temperature sensor, fix bar, and RS232 connected device Intelligent GPS car alarm ...