【LCD Display】Compact mini 3.5 inch head-up display with a built-in light sensor helps the head-up display to adjust its brightness automatically according to the environment. This car HUD rear visor helps you read data more clearly and is an essential gadget for your driving. 【Product Features】: Speed / RPM / Water Temperature / Voltage / Fuel Consumption / Driving Direction / Single Mileage / Single Driving Time / Hundred Kilometers Acceleration Time / Elimination of Fault Codes and other driving data, so that you don't have to look down on your windshield to easily read the car data. 【Compatibility:】 The OBD mode of this product is only applicable to most gasoline vehicles after 2008, and the GPS mode is applicable to any car. OBD mode directly reads the original car data, while GPS mode requires searching for satellites to display the data. When your car does not comply with the OBD protocol, please switch to GPS mode within 5 seconds of starting up. OBD2 mode is not compatible with hybrid electric vehicle, diesel car, pickup truck, RV, computer modified car, it is recommended to use the GPS mode.If you are unsure if your car can use the product's OBD mode, you can ask us. 【Gift Ideas】This HUD screen is powerful and affordable. This is a great gift for most people who want to be safe and have a very comfortable driving experience. Not only can you give it as a gift to yourself, but you can also give it to your wife, husband, family, friends or roommates. 【After-sales service】: Our products have been inspected twice by the quality inspection department before leaving the factory, and all the problems encountered by the products within one year have not been solved, and any problems about this product can be consulted in the form of e-mail, and we will provide you with better after-sales service! This head-up display has an exclusive light shield with an integrated design to avoid sight disturbances.The dual system mode of this car head-up display can be switched by one key, and the GPS speedometer has 24 kinds of interface displays, which can be switched at will. OBD+GPS car HUD has multi-function HUD as one, GPS speedometer car oil speed/rev/compass/water temperature/voltage/mileage driven，meanwhile digital gps speedometer，There are 6 user-friendly alarm settings, and the GPS magnetic field dual-mode compass can also indicate the driving direction for the digital speedometer for car. HUD display has a high-definition screen, the brightness of the automatic light-sensitive adjustment, head-up display using a light sensor sensing the degree of light-sensitive to adjust the brightness of the screen, at the same time, the car hud display dual-line use, simple installation, plug and play!digital speedometer for car mph with high-performance processing chip, strong performance and compatibility, dual operating memory and dual-core processor to ensure smooth high-speed operation. At the same time, the new function of car GPS speedometer mileage measurement allows drivers to know the actual distance travelled.