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 cars OBDHUD C3NOTWith 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 mode OBD2 mode including speed,RPM,water temperature,battery voltage,clock,driving time,driving distance,fuel comsumption,altitude,satellite numbers,turbine preure,air-fuel ratio,intake preure,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. Brightne 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 Plushave additional Navigation Features,can display the driving direction. Package Included: 1 xC3 HUD 1 xOBD Cable 1 x Cigarette Lighter Cable 1 xEnglish Manual 1 xCleaning Cloth Do drop