Geyiren M6 HUD 3.0 inch Car Head Up Display with OBDII & EUOBD System, Speed & Over Speed Alarm, RPM, Water Temperature & High Water Temperature Alarm, Voltage & Low Voltage Alarm, Freely Switch Between kilometers and Miles(Black)

About HUD HUD short for Head Up Display. It displays driving datas on the front windshield such as speed, rpm, fuel consumption, water temperature,voltage; Avoiding drivers become dangerous because of watching the instrument while driving. Drivers can read the driving information instantly, and can always keep the best state on the way with HUD. Features 1. Available for cars with OBD2 and EUOBD port (Car automatic diagnosis system), plug and play. 2. Screen 3 inch HD display. 3. Multi-color design makes the screen more abundant and easier to read. 4. Nano-technology to eliminate double reflections, more clear. 5. Rich contents: Speed, rpm, water temperature, voltage, low voltage alarm, high water temperature alarm,over speed alarm, freely switch between kilometers&miles. 6. Auto power on/off: HUD start and off with vehicle started and shutdown, effective protection of the car battery; Retaining the manual switch mode,more easy to control HUD. 7. Automatic and manual brightness adjustment mode, driving without glare. Display Functions 1. Light sensor: Change the unit's display brightness to suit the constantly changing environment whilst driving. 2. Engine speed. 3. Setting icon. 4. Unit: Water temperature ( Degree Celsius, Degree Fahrenheit), speed unit (KM/H, MPH), voltage unit (V). 5. Display area: Speed, voltage, water temperature. 6. Buzzer mark for alarm.