Universal GPS Speedometer 4.5" H1 Speed Odometer Mileage HUD Display Digital Speed Alarm MPH KMH Altitude Display Projector Features:[-1-]:Universal: Made of high-quality ABS and electronic component materials, compatible with most cars, such as buses, trucks, motorcycles, new energy vehicles, etc.[-2-]:Digital display: The speedometer can display the current vehicle speed, mileage and driving direction, and the digital display is more intuitive.[-3-]:Automatic light-sensing mode: Equipped with light-sensing elements, the brightness of the display is automatically adjusted according to the intensity of the external light to make it clearer.[-4-]:Alarm function: The speedometer has two alarm functions: speeding alarm and fatigue driving reminder, making your driving safer.[-5-]:No delay: Using 10Hz high refresh rate GPS and dual-mode chip, the refresh speed is fast, there is no delay, and the operation is smoother.Specifications:Type: GPS speedometerMaterial: ABS + Electronic componentItem color: BlackLight color: Green/WhiteDisplay information: speed, mileage, driving directionAlarm function: speed alarm, fatigue driving reminderTwo colors are available: green light, white lightScreen size: 2.4InchProduct size: 6.17*6.38*4.71cm/2.42*2.51*1.85inch (L*W*H)Packing box size: 14.3*9*5.1cmPacked weight: 141gPacking list:1*GPS speedometer1*USB cable1*Non-slip mat1*Manual1*Package boxWarning: This product working voltage is 5V, and it is forbidden to use a voltage higher than 5V for power supply. GPS display FAQ1. Nothing on the screen, no powerCheck 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. No speedAfter the power is on, the satellite icon flashes to indicate the state of star search. Please move the car to an open road and wait for the satellite icon to stop flashing before you can use it normally.3. Inaccurate speedCheck whether the unit is correct, kilometers KM/mile MPH, (speed unit switch reference setting item).When the car leaves the factory, the manufacturer increases the speed displayed on the dashboard by 5-7%. International standards are based on satellite data.Fine-tune the vehicle speed, such as the instrument displays 100 Km/h, the machine displays 105 Km/h, adjust the parameter value to 102.4. The driving direction is displayed incorrectlyWhen there is no speed, the satellite cannot distinguish your driving direction. It will display normally only after the speed exceeds 5KM/H.5. The speed is still displayed after the car stopsUnderground parking lots, tunnels, overpasses, when there are obstructions, the signal will be unstable, and the satellite will drift. Please drive the car to an open road.6. Turn off the buzzerDial left for 2 seconds to turn off the buzzer, dial left again for 2 seconds to turn on the buzzer.Note: 1.Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the picture.2.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Return Policy All of our items come with a 30-day free return policy. If you need to return, please contact us, let us know the detailed problem and send us some pictures for confirmation. We reserve the right to refuse any returns for objective reasons. Shipping Policy All of our items are shipped free with tracking numbers. Orders will be shipped within 3 working days upon receipt of payment. Most orders will be shipped within 1 working day. In most cases, shipping takes 8-12 working days.