If you do not know how to use the OBD2 or the CD is broken when it arrives， please contact me. I will offer you best solutions. You can also search on youtube for how to use obdII to find answers. Product details:1. Display current sensor data， including: Engine RPM， Calculated Load Value， Coolant Temperature， Fuel System Status， Vehicle Speed， Short Term Fuel Trim， Long Term Fuel Trim， Intake Manifold Pressure， Timing Advance， Intake Air Temperature， Air Flow Rate， Absolute Throttle Position， Oxygen sensor voltages/associated short term fuel trims， Fuel System status， Fuel Pressure etc.2. Clear trouble codes and turn off the MIL ("Check Engine" light)3. Compatible Phones: Android Smartphone4. Compatible Software: Easy OBD2， ScanMaster ELM， wOBD Crazy and More5. Processor: ELM327 v1.56. Read diagnostic trouble codes， both generic and manufacturer-specific， and display their meaning (over 3000 generic code definitions in the database).7. Supported Software Compatible for Windows， OSX， Palm， Pocket-PC， Linux， Android， DOS， and Windows Smartphone8. Supports all OBD2 Protocols (ISO15765-4 (CAN)， ISO14230-4 (KWP2000)， ISO9141-2， J1850 VPW， J1850 PWM)9. Works with Android Torque (Suggested)10. Works with OBD2 Complaint Vehicles Operating voltage: 12V， internal protection from short circuits/overvoltagesNominal idle current: 45mAItem Size: 4.5 * 4.6 * 2.3cmItem Weight: 27.4gPackage Weight: 93g Support OBDII Protocols:SAE J1850 PWM (41.6 kbaud) SAE J1850 VPW (10.4 kbaud) ISO 9141-2 (5 baud init， 10.4 kbaud) ISO 14230-4 KWP (5 baud init， 10.4 kbaud) ISO 14230-4 KWP (fast init， 10.4 kbaud) ISO 15765-4 CAN (11 bit ID， 500 kbaud) ISO 15765-4 CAN (29 bit ID， 500 kbaud) ISO 15765-4 CAN (11 bit ID， 250 kbaud) ISO 15765-4 CAN (29 bit ID， 250 kbaud) SAE J1939 J1979 Packing list.jpg1 x Blue Small Bluetooth OBD2 / OBDII ELM 327 V1.5 Auto Diagnostic Scanner Tool1 x CD driver