3in Car Dashboard GPS Speedometer HUD Display KM/H MPH Switching Overspeed Fatigue Driving Alarm for SUV Truck Feature: 1. Multifunction HUD: This HUD can not only display the driving speed of the vehicle in time, but also display the driving direction, single driving time and single driving mileage through th. 2. High Accuracy: Accurately search the number of satellites, speed anddata from satellites, timely and accurate. Especially the direction of theis not affected by the magnetic field. 3. Alarm Function: Overspeed alarm and fatigue driving alarm to ensure your safe travel. The default setting is 120KM/H or 120MPH. You can adjust it according to your needs. 4. 3in Screen: Large screen display, easier and more comfortable to read. Large and green font, the green light will protect the driver's eyes, especially suitable for long distance driving. 5. Universal Fit: Collect speed from GPS satellites, not related to car engine, so it is compatible with all vehicles, including cars, trucks, pickups, SUVs, scooters, trains, , bicycles, boats.Specification: Item Type:HUD Display Material: ABS, Metal Display Size: 3inch Function: Speed Single Mileage Driving Direction Search Satellite Support KM/H and MPH Free Switching Alarm: Speeding Alarm, Fatigue Driving Reminder Fitment: Cars, SUVs, Trucks, RVs, Vans, Buses, Motorcycles, Etc.Package List: 1 x HUD Display 1 x Power Cord 1 x Mounting Bracket 1 x Sticker 1 x ManualNote: To work properly, the following 3 conditions must be met: 1. GPS positioning is successful. 2. Thecan only work properly when the vehicle is in motion. 3. When driving a car, the direction is the direction the car is traveling. Special reminder: The working voltage of this product is 5V, and it is forbidden to use a voltage higher than 5V for power supply.How to use: 1.Fixthesuctioncupbrackettothedashboardorfrontwindshield. 2.Connectthedisplaytothepowersupplyandperformsatellitepositioning.Afterthepoweristurnedon,thesatelliteiconflashestoindicatesatellitesearch,andtheGPSsatelliteiconstopsflashingbeforeitcanbeusednormally. 3.Mountthedisplaytothestand. 4.Useafterstartingthevehicle.About