Multi-functional HUD product developed based on OBD II interface; Has good cost-performance ratio; Easy nstallation and debugging within 3 minutes; Plug and play: HUD can auto adapt to vehicle type which is in line with OBD II or EU OBD (On-Board Diagnostic System); Comprehensive display: HUD can display many parameters at the same time as follows: vehicle speed / engine speed / water temperature (voltage throttle valve position ignition advance angle time of 100 km acceleration) fuel consumption mileage low fuel tips engine failure; Diversiform display mode: Driver can chose normal display mode high- speed display mode and automatic display mode; Free switch: Km and mile can be switched freely to meet the need of inch auto meter; Suitable size: 5.5" display which is very clear for driver to read data; Automatic power on and off: starting with the vehicle starting stopping with the vehicle stopping to protect the vehicles battery. Moreover we pre- serve the hand switch function to control the HUD; Flexible alarm mode: HUD can offer single-stage and four-stage over speed alarm modes to choose to make driving safer; Engine speed alarm: it contributes to shift gear in time to save fuel; Flexible brightness adjustment