Automatically adapt to the automobile models with OBD II (Bus Automatic Diagnostic System) interface. Display the engine speed, speed, voltage, temperature, fuel consumption and other information on the front windshield of the driver's eye level. Overspeed warning, more security for driving. The precise, HD and high-brightness LED display, easy to read information. The gear shift warning, conductive to new driver learners. The display brightness can be automatically or manually adjusted. Updated and newly added functions, more stable and better performance. Specification: Brand: ifound Display: LED Digital Environment Temperature: -40 ~ 80 degree Celsius at atmospheric pressure 86-106KPa Alarm Sound Level: over 30db Working Voltage: 9V-16V(12V DC / 70mA) Product Size: Approx. 9 * 5.7 * 1.5cm / 3.54 * 2.24 * 0.59in Product weight: Approx. 47g / 1.65oz The information screen displays: 1. Speed: The number can indicate the current speed. 2. Rotation speed: indicates the rotating status of the engine and the scale measured represents the speed reached. 3. Water temperature: When the temperature reaches 100 degree centigrade, alarm will be given automatically with alarm light on. 4. Gear shifting reminding: It will remind the driver to gear up to save fuel when the engine speed and vehicle speed come to a certain ratio. 5. Overspeed reminding: the icon of overspeed will flicker and alarm when the vehicle exceeds the speed limit set up in advance. 6. Real-time one hundred kilometer/instantaneous fuel consumption: display fuel consumption of one hundred kilometers when the vehicle is moving, in L/100km. 7. Unit of kilometer/miles: in the international system of units, kilometer/hour & mile/hour are commonly used, in km/h & mph. 8. Battery voltage: when the battery voltage is less than/reaches 12V, the caution light will light up to remind the driver. 9. Buzzer mark: pressing the switch button can turn on or turn off the sound of the buzzer. Package includes: 1 * Host Machine of HUD(2nd generation) 1 * OBD-II Connecting Line 1 * Reflecting Film 1 * Non-slip Mat 1 * Chinese User Manual