There are two different models for choose, please kindly read the product information clearly before purchasing.① C3 HUD(OBD+GPS) With live Navigation / ② C3 HUD(OBD+GPS) Specifications: ModelsC3 HUD(OBD+GPS) With live Navigation / C3 HUD(OBD+GPS) Without live Navigation Compatible: C3 compatible with all cars OBDHUD C3 NOT 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: 5V18VDC (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 pressure,air-fuel ratio 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 x C3 HUD 1 x OBD Cable 1 x Cigarette Lighte Cable 1 x English Manual 1 x Cleaning Cloth