GPS vehicle tracker/GPS AVL/camera AVL canera security Digital,analog I/O port 2 RS232 TF card RS3000C1 is a ... Royaltek REB-3571I/O Inputs Emergency Button,2xLow Voltage Analog, 2xHigh Voltage Analog, ACC Status, Engine Status, Door Status, Brake Status, ... , GPS receiver failure, illegal ignition, illegal door-opening, Voltage Analog Input, Low battery voltage alarm, emergency brake, etc.Serial Port ...