Display functions: 1. Satellite icon: After the satellite is found,the GPS light stops flashing and stays on for normal use.2. Vehicle speed display3. Compass: N (North) E (East) W (West) S (South)4. Speed unit: KM/H (kilometers) MPH (miles)Feature:1. Screen 2.6 inch HD display,Small and exquisite.2. Nano-technologyto eliminate LCD,more clear.3. 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.4. Automatic and manual brightness adjustment mode,driving without glare.5. Plug and play, suitable for all cars. Specification: -Speed,driven distance -Driving direction -Automatic light sensitivity -Mile and kilometer switch,sound alarm switch -Speeding alarm,fatigue driving reminder Package included: 1 x Head Up Display 1 x Non-slip Mat 1 x USB cable 1 x Manual How to Install the HUD Car Computer:1. Insert the product into the check port on the vehicle OBD computer;2. Insert the other end of the product into the data interface of the host;3. After the product is inserted into the host and the car is started, wait for the communication linkage between A202 and the car;4. After the linkage is successfully established, the host will send a "drop" sound, at the same the display screen displays vehicle protocols and then indicates that it is the first time the product is used to set up parameters. (International universal OBD plug protocol definitions stipulated by SAE).Common problem:Q1: Why does it automatically turn off after a period of time?A1: Its default sleep time is 30s, So when your engine is turned off, it will automatically turn off after 30s .please choose "Sleep Time Set" to set the sleep time.Q2: Why my car dashboard lights or fault alarm lights are caused to be lit up abnormally?A2: When used in some cars, car dashboard lights or fault alarm lights are caused to be lit up abnormally, choose"Product inf" -"Matching inf" to see the solution, and use needle-nose pliers to twist off excess pins to eliminate such phenomena.