Screen 5.8 inch HD display and head-up display. Speed warning can be very helpful for anyone on there dash. of sensors,fits most car types,easy to install, plug and play. HUD power on and off automatically, effective car battery protection. Bright and auto adjust;Extremely tunable; Driving without . Nano-technology eliminates double reflections,clearer and easier to read. Rich contents: Speed,RPM,Water temperature,Voltage,Instantaneous fuel consumption,Average fuel consumption,Driving distance measurement,Shift reminders,Fatigue driving reminders,Low voltage alarm,High water temperature alarm,Over speed alarm,Engine failure alarm, Eliminate the fault code,Freely switch between kilometers & miles. Environment temperature:-40 - + 80 Atmospheric pressure:86-106KPa Relative Humidity:10% -95% Environmental noise:less than equal 60dB (A) Alarm sound level: equal 30dB (A) Working voltage:9V - 16Vdc (12Vdc / 400mA) Colour:Black Material:Plastic Package Contents: 1 * 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.