GEYIREN G2 GPS HUD Head Up Display Car Speedometer On-Board Computer Smart Clock Digital Gauges Auto Electronics Acceories For All Car Over Speed Alarm you could set a speed alarm manually Dispaly Speed When Racing Show Time After Stopped MPH or KM/H 2 Modes Freely Switch GPS Compa Not lost even in the desert Satellite Real Time its will calibration time automatically,only need to adjust time zone after device received satellte Single Driving Time & Distance Do you want to know single driving time & distance Over-speed Alarm+Fatigue Driving Alarm 6 Display UI Switch it freely:1.Speed2.Speed+Compa+Ambient Light3.Speed+Time+Ambient Light4.Number of Satelines +Compa+Ambient Light5.Driving Time+Compa+Ambient Light6.Driving Distance+Compa+Ambient Light Main Function: Speed Clock Driving Time Driving Distance Number of Satelines Compa Light Sensor Speed Alarm Fatigue Driving Reminder Brightne Sensor Compatible With All Car Car SUV Trunk Bus Pickup Diesel Car Electric Vehicle.... GPS+BEIDOU Global Positioning System Real Time Speed & Other Data From GPS or BEIDOU Satellite Easy to install 1.Satellites2.Direction : N-North S-South W-West E-East3.Multi-function display: vehicle speed, time, vehicle speed + time, number of satellites, travel distance, travel time (Short pre the wave button vertically to change the function)4.Trip mileage5.TIM clock6.MPH miles7.KM/H kilometers8.Wave button9.Speaker10.USB interface11.Light Sensor FAQ 1.The screen without any display, and no power Check whether the USB cable is damaged, replace the USB cable for testing, and prohibit the use of voltage higher than 5V for power supply 2.Without Car Speed After HUD power-on, the satellite icon flashes will start to look for the satellite. Please driving the car to the open road. It will work after it stops flashing 3.Time calibration When the satellite icon flashes and no satellite is received, enter item 6 of the setting item to adjust the local time zone. The default is East Zone 8.After the satellite icon flashes and the satellite is found, enter item 6 of the setting item to adjust and calibrate the local time. 4.Inaccurate Speed a.First check the speed unit is correct or not, the speed unit including KM/H and MPH, (please refer to the setting mode to switch the unit).b.The car manufacturers usually make the dashboard speed 5-7% higher than the ECU. The international standard is based on satellite data.(if the dashboard shows 100, and the device shows the 105, change the default value at 102) 5.Driving direction display error Satellites cannot tell where you are driving when there is no speed. After the vehicle speed exceeds 5KM / H, the direction can be displayed normally. 6.Speed is still displayed after the car stop Under the underground parking lot, tunnel, under the overpa, there will be unstable satellite drift when there is obstruction. 7.Turn off the buzzer Push left for 2 seconds to turn off the buzzer, do it again to turn on.