About how to use: 1.Plug the scan tool into the vehicles OBD2 connector, then run the APP. 2.Select your vehicles brand and model. 3.Turn ignition on and clicking setting menu, select hardware iOBD2-Mini. --The connector should be located under the dash. --Look below the steering column, on the lower dash above the clutch pedal, or possibly behind the ash tray. Diagnostic Function: 1.Reads DTCs: Reads and clears DTCs stored in the engine and shows their detailed information. 2.Live data: Reads the parameters. 3.Readiness test: Click Readiness test in the menu, the screen will display the test status of the car. My Dashboard: 1.Idle mode: Display the engine rotational speed, water temperature, battery voltage, Air-intake temperature, instant fuel consumption (static), average fuel consumption etc.. 2.Cruise mode: Display the vehicle speed, current engine load, water temperature, travel time, travel average speed, instant fuel consumption(dynamic) etc.. Performance test: 1.Accelerate/Decelerate : Test acceleration / deceleration process time and distance. 2.0 to 400m acceleration : Test spending time from 0 to 400 meters. Specifications: 1. Voltage:9-12 V 2. Dimension:2x2x1 In 3. Weight:0.26 Lbs Packing: 1x IOBD2-Mini device 1x User manual Your attention pls: Please don`t operate this car scan tool when driving your car. Any distraction may cause an accident.