GEYIREN M17 HUD Head Up Display Dual System OBD2 + GPS              Special Reminder:  1. The working voltage of this product:  11V~18Vdc (12Vdc/200mA) . Please use  the USB cable if car voltage >24V.  2. This product is a dual system:Users can  freely choose the mode.             OBD System (For OBD2 EOBD car)   Functions:Vehicle speed,engine RPM,water temperature,voltage,fuel consumption,altitude,clock, travel time,travel distance,number of compass satellites.             GPS System (For all car)   Function: speed, voltage. Compass, number of satellites, speed icon, decorative strip.             how to switch system ?   press the '+' key to select OBD or GPS system,  before the OBD icon on screen stop to flash,it will automatically save and enter your last selected option.                       Multifunctional Zone Speed   water temperature, voltage, mileage, driving time, fuel consumption, altitude, clock, 100 km acceleration                       Safe Driving   80% of Accidents are Caused by Distraction Bow Your Head 3Seconds = Drive a Car 50 Meters Blindly                  6 Useful Alarm Functions                                       GPS can be used for all models   the navigation position displayed on the windshield of the car during driving.                       Buyer Show                          How to Install the HUD Car Computer:   1. Insert the product into the check port on the vehicle OBD computer;  2. Insert the other end of the product into the data interface of the host;  3. After the product is inserted into the host and the car is started, wait for the communication linkage between A202 and the car;           OBD FAQ             1.No function is displayed,no power   Check whether the OBD cable is tight connection, pull down repeatedly to confirm, please try it on another car if still not workable, analysis if it is a cause from OBD diagnostic interface,if yes,please repair it and connect the device again.      2.Only the car voltage displays and be automatic power off after 30 second   (1) This product is only available for OBDII and EOBD cars when it is in OBD2 mode  (2) OBD2 is a car protocol (U.S.A Cars:2003 Other regions:2007)  (3)This product OBD2 mode does not support OBD I and JOBD  (4) Switch to the GPS system using the USB cable to display, within 5 seconds of power short press the '+' key to select the GPS system.      3. Shut down and restart   Indicates that the voltage is higher than the starting voltage 13.2V, enter the setting menu and short press the '+' key to item 11, set voltage to 13.6-13.8V (the device can only be turned on after the vehicle voltage is higher than the setting voltage)             GPS FAQ             1.