Features: brand new and high quality HUD Display: It displays driving datas on the front windshield such asspeed,RPM,water temperature,voltage,single mileage etc;to avoid drivers unsafety because of watching the instrument while driving.Drivers can read the driving information instantly , and can for always keep the best state on the way with HUD. Big Screen & Clear Display: The Nano-Technology. High clearness projector, to eliminate unwanted reflections and can make the display information more sharper,it is pretty clear in the sunny day,rainy day.Muti color makes it look more vivid and more comfortable. Light sensor:HUD can automatically adjust the brightness according to the environment,It will bring more fun and Technological sense to your driving experience. Plug & Play: With the button function,you can easily set up and switch various functions you need.There are two USB ports,you can choose one according to your needs. (Plugging in two ports at the same for time could burn out your car.) Safe Driving: This unit has equipped with OBD cable.We do not need to damage your car but just plug them in,then you can use it and modify your car.This car HUD device has a detection for error code and make a alarm.such as low voltage alarm,over speedalarm,Fatigue driving alarm,high water temperature alarm,engine fault code alarm.These reminders help you avoid the accidents to keep the car in good condition, keep your driving safely. Main Functions Display: Speed, RPM, water temperature, battery voltage, fuel consumption, driving miles, auto brightness, engine failure, automatic switch machine and buzzer. Specifications: Material: ABS System: OBD Screen Type: LED Screen Size: Approx. 3.8 inches Size: Approx. 9x22.6x5.3 for cm/ 3.54x8.89x2.09 inches Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x for Head Up Display