... compatible with original lock system kind of sensor RS3000B1 is one kind of intelligent GPS two way car security system/car alarm system/vehicle alarm system to support complete car realtime tracking, alarm ... ,1575.42MHZI/OInputsEmergency Button, 2xLow Level Voltage, 2xHigh Level, ACC, Engine, Door Open, Brake , 2x A/D (10bit digital,5V,12V ...