Bullet Points: 1HUD Function: Short for head-up display. Driving data such as speed, rotation speed, water temperature, voltage and single mileage are displayed on the front windshield. HUD avoids the danger of the driver looking down at the instrument panel. By checking the data on the front window glass of the car, the security of the driver is ensured and the driver is in the best condition on the way. 2Practical Function: HUD can automatically adjust brightness according to the environment, high-definition display of mileage and vehicle speed, speed unit switching: KM/H, MPH. 3USB Power Supply: Plug and play, no need for professional installation, suitable for all cars, the car will be powered off when the car is turned off, and will not lose the car battery. 42 Alarm Functions: Speeding alarm and fatigue driving alarm to ensure the safety of the driver. 5GPS and Dual-mode Chip: Up to 10 Hz refresh rate without stuttering delay. Specification: Name:HUDHead-upDisplay Model:G1 Displaycolor:white,green Material:ABS+PC Size:about63.8*61.7mm/25.12*24.29in Inputvoltage:DC5V Inputcurrent:50~120mA,canusemobilepowersupply Workingtemperature:-30~80degrees Itcanbeusedinallcars,vehiclesandtrucksonthemarket.PackingList: 1XGPSHUDSpeedometer 1XUSBCable 1XSlip-protectiveMat 1XUserManualNote:Duetothedifferenceinlightingandscreensettings,thecoloroftheitemmaybeslightlydifferentfromthepicture.Duetodifferentmanualmeasurements,pleaseallowaslightsizetolerance. See more product details 1. [ Multiple Functions ] Car Head up Display HUD is avoiding the danger of the driver looking down at the dashboard, helping drivers stay in top shape on the road, and keeping drivers safe by viewing data on the car's windshield. 2. [ Economic Head-Up Display ] HUD Speedometer for Car's mileage and speed can be displayed in high-definition, speed unit switching is KM/H, MPH, and can be automatically adjusted the brightness according to the environment. 3. [ USB Powered ] Car GPS Speedometer is USB powered, plug and plays, no professional installation required, displaying driving data such as speed, water temperature, voltage, and single mileage on the front windshield, applicable to all cars, when the car is turned off, the power will be cut off, and the car battery will not be consumed.4. [ Particular 2 Alarm Functions ] Heads up Display for Cars is equipped with two different alarm functions, including over-speed alarms and fatigue driving alarms to ensure the safety of drivers, and a caring safety butler during the journey. 5. [ Exquisite Dual-mode Chip ] Adopting GPS and Beidou dual-mode chip, up to 10 Hz refresh rate, no stuttering delays, Digital Car Speedometer is effectively reducing the problem of data delay, real-time follow-up driving speed, ensuring smooth high-speed operation which provides the data to help your car travel life.