Functions: 100% compatibility OBD+GPS dual system. Light sensor: HUD can automatically adjust the brightne according to the environment. Speed icon: OBD mode: speed, car ECU data. GPS mode: satellite data , compa. System icon: short pre the + key within 5 seconds to choose OBD or GPS system. Speed display. Speed unit: KM/H=kilometer/hour, MPH=Mile/hour. Satellite icon: observe Satellite icon: after the satellite is found, it stops flashing and goes out, then it can be used normally. Driving direction: driving direction. indication:W=West, N=North, S=South, E=East. Over-speed alarm icon. Water temperature icon, Voltage icon. 10.a + =100km acceleration test, ASL=altitude, LHK=fuel consumption, MIN=travel time, TRIP=travel mileage. Multi-function area: speed, water temperature, voltage, mileage, driving time, fuel consumption, altitude, clock, 100 kilometers acceleration. Fit for all cars,perfectly compatible with vans trucks buses cars off-road vehicles SUVs and other vehicles. Specification: HUD Model: M17 Material: ABS+PC System: OBD+GPS dual system GPS system: Compatible with all cars. OBD system (cars that support standard OBD2 standard interface) Notes: The working voltage of this product: 11V~18Vdc (12Vdc/200mA) Please use the USB cable for cars with higher than 24V This product is a dual system: after power on, the screen flashes, pre the '+' key to select the OBD or GPS system, and automatically enter the last selected system after 5 seconds of no operation How to Install the HUD: 1. Insert the product into the check port on the vehicle; 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 succefully 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). Package Included: 1 x M17 HUD 1 x Micro USB Cable 1 x Non-slip mat 1 x OBD Cable 1 x English Manual 1 xReflective film 1. WORLDWIDE