... a GSM/GPRS modem and a bulit-in alarm system. RS3000B1 monitors various vehicle sensors, and ... and electricity control, sound/light alarm, Remote controller signalAlarm SystemHijack alarm, Anti-theft alarm, Power discarding, GPS antenna short ... , Voltage Analog Input, Low battery voltage alarm, emergency brake, etc.Backup Battery internal, 12v, 500mAhBackup Time40minutes~90minutesSerial PortRS232Two ...