Multi-Functions Trip Computer P21 Head Up Display Car Gauge, OBDⅡ Diagnostic and Slope Meter Speedometer Safe Driving Computer Overspeed Alarm for All Vehicles Thank you for purchasing our product. This product reads the driving data of the car through the OBDⅡ interface of the car ECU, such as vehicle speed, rotation speed, fuel consumption, water temperature and voltage, etc. Instantly read driving information under the condition that drivers' view does not shift during the driving of the car.To keep the drivers' eyes on road always to avoid the dangerous of lowering down head. This product does not rewrite any data in the ECU. This product supports 12 kinds of language: English, simple Chinese, Traditional Chinese, Japanese, Korean, Thai, Russian, Arabic, Malay, Spanish, German, and French.  Features: P21 is a high-quality solution that integrates OBD, GPS, and electronic slope meter. Realize one machine with multiple functions and meet the needs of multiple scenarios. Built-in GPS+BeiDou and Galileo chip module, can receive up to 32 satellites. High-precision altitude, time, latitude and longitude, and other information to meet your outdoor self-driving needs. P21 has 12 languages and is currently the most language product on the market. Split bracket, the bracket can be rotated in 360 all directions. It can be hung on the A-pillar or placed in the center console. The ambient light is on after power on, and the colors are blue, red, and purple (the colors can be switched at will). When there is an alarm, the color will flash red and beep (keep the brightest state), flashing an alarm, safer and more intimate. Real-time monitoring of left and right, downhill, and uphill side inclination angles, providing information on car attitude changes for outdoor off-road and extreme crossings, and ensuring driving safety. Larger font, clearer and smoother screen. This car head up display with 2 modes, OBD and GPS mode. If you want e OBD mode, please check whether your vehicle has an OBD agreement. GPS mode is suitable for all vehicles. If your car is not compatible with OBD, please use GPS mode. OBD Mode: speed, water temperature, voltage, fuel consumption, RPM, clock, driving time, driving distance, intake pressure, oil temperature, air-fuel ratio,turbine pressure, altitude, driving direction, throttle, intake temperature,  gearboxing temperature, engine load, up and down slope angle, left and right tilt, acceleration test, brake test. Alarm: Overspeed alarm, RPM alarm, water temperature alarm, voltage alarm, tilt alarm.     GPS Mode: speed, voltage, satellite numbers, altitude, driving direction, driving time, up and down slope angle, left and right tilt, acceleration test, brake test. Alarm: Overspeed alarm, low voltage alarm, tilt alarm. Note: This product is only available for OBDII and EOBD cars when it is in OBDII mode. Suitable for cars produced after 2008 year. This product OBDII mode does not support OBDI and JOBD.  If your car is not compatible with OBD mode, please use GPS mode. Specifications: Model: P21 Color: Black Material: ABS + PC Screen type: LCD Screen size: 3.5 inch Resolution: HD Input signal: OBDⅡ Working voltage: 11V-18Vdc Prodcut size: 11.5 x 8.2 x 2.8cm Package size: 13.3 x 9 x11 cm Package weight: 320g Packing List: 1 * P21 Host 1 * Rotating Suction Cup Holder 1 * User Manual 1 * OBD Cable 1 * Non-slip Mat