Functions: 100% compatibility OBD+GPS dual system. OBD2 system: Function: vehicle speed, water temperature, voltage, fuel consumption, RPM, clock, single driving time, driving distance (single/total), intake preure, oil temperature, air-fuel ratio, turbo preure, altitude, driving direction, throttle, km per liter, intake air temperature, transmiion temperature, engine load, slope, tilt angle, acceleration test, brake test. Alarm: Overspeed Alarm, RPM Alarm, Water Temperature Alarm, Voltage Alarm, Tilt Alarm GPS satellite positioning, make sure you don't go in the wrong direction. Perfect for traveling and driving adcentures. Obtain the current driving speed, with over speed alarm function, as well as display the local time. Real-time voltage monitoring, can avoid safety hazards caused by too high or too low voltage, prolonging the lifespan of the battery. With this head-up display, you can clear the fault codes yourself without having to go to a repair store and pay for the repair. It allows you to understand your car more clearly without looking down at the dashboard and adds a sense of technology to your car. Suitable for all vehicles, such as vans, trucks, buses, cars, off-road cars, SUVs, and other Vehicles. Specification: HUD Model: P2 Material: ABS+PC System: OBD+GPS dual system GPS system: Compatible with all cars. OBD system (cars that support standard OBD2 standard interface) Package Included: 1 x P2 HUD 1 x Micro USB Cable 1 x Non-slip mat 1 x OBD Cable 1 x English Manual 1 x fixed bracket Do drop