This product can set different parameter over-limit alarms, such as over-speed alarm, fatigue driving reminder, etc. Multiple Functions Display: OBD mode: RPM, single trip distance, altitude, driving time, clock, water temperature, driving direction. Easy to Install, plug and play, fully compatible, stable and safe intelligent output, OBD system interface, GPS system USB power supply., Auto power on/off. GPS+OBD2 C800 OBD2 HUD Car Head Up Display GPS Sytem Speedometer Windshield Projector Car Electronics Accessories Package Includes: 1 x Car HUD 1 x OBD Cable 1 x Reflective Film 1 x Non-slip Mat 1 x User Manual V=Unit of voltage, LKH=Unit of fuel consumption,including Instantaneous fuel consumption (idle speed),100 km instantaneous fuel consumption (in driving), average fuel consumption (after driving). C800 HUD Head-Up Display OBD2 Multi-Function Car GPS GPS mode:Clock,driving direction,single mileage,altitude,driving time. Available for cars with OBD2 and EUOBD port(Car automatic diagnosis system) ,plug and play. Icons: satellite signal / error code /Fatigue driving /Driving direction Speed Speed unit: KM/H=kilometer/hour, MPH=mile/hour. Wire or Wireless : wired Size Name : 173*85*31MM Output Frequency : 12V Rated Power : 12V Product Name : head-up display Model : 173*85*31MM Color : black Unit size : 173*85*31MM HUD Weight : 40g Function : Speed, RPM, Overspeed Alarm, Water Temperature,etc. OBD System:speed, RPM,water temperature,driving voltage This product can set different... 1RPMOBD mode Satellite numbersGPS mode2 OBD modeBattery voltageFuel consumptionSatellite numbersGPS modeBattery voltageSatellite numbers3Icons Satellite signal Error code Fatigue driving Driving direction4Speed5Speed unitKMHkilometerhour OBD Mode: battery voltage/fuel consumption/Satellite numbers. Car HUD short for head up display, it reads dash om OBD2 interface and reflects onto original mirror