... , Printer (optional) 3.Vehicle examination and diagnostics by CAN-BUS 4.3D accelerometer 5.Support sending GPRS data to IP or ... , 6 digital input ports(2 positive input, 4 negative input), 3 digital output ports, 4 serial ports and 1 mini USB port ... tracker,vehicle gps tracker with optional RFID card reader,LCD,Camera,DVR supporting