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 compa satellites. GPS System (For all car) Function: speed, voltage. Compa, number of satellites, speed icon, decorative strip. how to switch system ? pre 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 HUD M17 Products Detail 6 Useful Alarm Function GPS can be used for all model 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 pre 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 pre 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.No speed The GPS is flashing to search for stars. Please move the car to an open road. After the satellite is found, the GPS light will be on and off, and it can be used normally. 2. Inaccurate speed When the power is turned on, long pre the M key for 5 seconds to enter the menu options, the menu displays 1, short pre the M key to enter the parameter value 107 and flash, fine-tune the parameter value according to how much difference between device and the dashboard.(the dashboard displays 100 KM /H, the device displays 105KM/H and adjust the parameter value to 102 through the - key), after adjustment, long pre the M key for 5 seconds to exit. 3.Inaccurate Satellite Time Enter the setting menu item and short pre the + key to item 13, short pre + key to adjust the local time zone, if the HUD finds the satellite signal, only need to adjust to the local time, after adjustment, pre the M key for 2 seconds to save and exit pls contact with us if you've got any questions!