There are two different models for choose, please kindly read the product information clearly before purchasing. C3 HUD(OBD+GPS)With live Navigation/ C3 HUD(OBD+GPS) Specifications:ModelsC3 HUD(OBD+GPS)With live Navigation/C3 HUD(OBD+GPS) Withoutlive Navigation Compatible : C3 compatible with all carsOBDHUD C3NOT With live Navigation: C3 including OBD system and GPS system,dual systems,and has two cables,OBD cable and USB cable.OBD2 mode working voltage: 5V~18VDC (12vdc/200mA)GPS mode: when voltage is higher than 24v, please use a USB cable for GPS modeOBD2 mode including speed,RPM,water temperature,battery voltage,clock,driving time,driving distance,fuel comsumption,altitude,satellite numbers,turbine pressure,air-fuel ratio,intake pressure,KM/H,MPH,data stream.GPS mode supports speed,driving time,driving distance,satellite numbers,data stream.C3 supports speed alarm,RPM alarm,water temperature alarm,voltage alarm,DTCS alarm,fatigue driving reminder.Brightness can be adjusted according to the environment.Auto automatic light sensitive, 1 for the darkest, 8 for the brightest.OBDHUD C3 With live Navigation:C3 Plus have additional Navigation Features,can display the driving direction.Package Included: 1 xHUD 1 xOBD Cable1 x Cigarette Lighter Cable 1 x English Manual 1 xCleaning Cloth About G4S HUDFunctions: Intelligent GPS vehicle speed and time display: GPS vehicle speed, satellite time,compass, overspeed alarm, driver fatigue reminder.Equipped with high-definition LED screen for clearer information display, ultra-mini design and full of technology.Features a GPS navigation direction compass to help drivers by indicating directions.With a light sensor that adjusts its brightness according to differentlight, it is very clear in bright light, providing a safer day and night driving experience.GPS+BeiDou dual-mode chip, so you don"'"t need to worry about compatibility issues and latency problems.Powered by the USB cable, automatically powers on and off according to the engine ignition.Compatible with all vehicles around the world, with fast speed refresh and no latency.Just mount the device near the dashboard or use the 360-degree rotating suction cup mount to the windshield. Specification: Model: G4SScreen Size: 2.5 InchMaterial: ABS+PCScreen Type: LEDApplicable models: UniversalColor: Green, White Package Included: 1 x G4S HUD1 x Micro USB Cable1 x Anti-Slip Gel Pads1 x Rotary Holder1 x English Manual Do drop