Universal Car HUD Display M22 USB Speedometer with Compass for Vehicles Feature: Auto adaptable vehicle models are compatible with for USB II or EUUSB (vehicle automatic diagnostic system) vehicle plug and play. Vehicle Speed, Engine Speed, Water Temperature (Voltage/Throttle Position/Ignition Advance Angle/100 km Acceleration Time), Instantaneous Fuel Consumption, Average Fuel Consumption, Cruise Range, Low Fuel Tip, Rest Tip, Engine Failure, and Display at the same time. The speed alarm indicates that it can help shift gears in time to achieve fuel saving purposes. Material: plastic colour: black Package Contents: 1 set heads-up display Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.