1. If your car is pre-2004 (for US automakers) and pre-2008 (for European/Asian automakers), the protocol is not suitable. . 2. After receiving the package, please test it on your car as soon as possible. 3. According to customer feedback, it is not suitable for some special vehicles, such as electric vehicles, vehicles, hybrid vehicles, pickup trucks, passenger cars, etc. If you still have questions, please contact us before buying, preferably telling us your car make/model/year/agreement before buying. Real 2.6 inch TFT LCD multi-color smart display The first scan show the vehicle protocol Add new functions: Accelerating competitive mode, brake performance test, can read the entire car data stream information. Rich content: vehicle speed, engine RPM, water temperature, Oil tepmerature, intake pressure, voltage, instantaneous consumption, average consumption, driving distance measurement, driving time, low voltage alarm, high water temperature alarm, over speed alarm, engine fault code alarm, the fault code, freely switch between kilometers & miles Multi-function display mode or simple function display mode can be switched freely to show the above content Two-speed unit: MPH and switch freely Model: P10 - OBD speedometer NO NEED TO BOW View vehicle data such as speed, water temperature consumption, RPM, and more without moving your vision Color: Black Material: plastic Package Contents: 1 x Car HUD Head 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.