The ISO 9141 multiple ECU simulator provides a professional OBD development platform which allow the user to test the OBD functionality on the table. Simulates 4 differnt ECUs. reading VIN and suspended DTC is possible . Using 5 potensiometer , 5 live data can be changed and some fixed PID values are provided. Pressing DTC bouton the trouble codes are generated and the MIL LED is ON. Service 4 commands clear the DTCs and the MIL LED. Connection to the tester is provided via a J1962 female OBD port . it needs an external 12 V power supply . More information you can get from the corresponding chipset datasheet.