Tigrezy - Car hud Head Up Display, C80P Digital gps Speedometers with mph/kmh Speed Alert Fatigue Driving Alarm 4.5 Inch led Screen, for All Cars

【GPS Speedometers】Quickly collect speedometers from GPS satellites, and the satellites can be locked in real time. More accurate than OBD HUD, GPS hud has the same working logic as speed radar. It has 100% versatility for all vehicles, including cars, vans, off-road vehicles, trucks, trains, scooters, motorcycles, bicycles and boats. 【GPS HUD display】Driving speed, single driving time and mileage. When using it in a car, plug it into the car's USB port. If there is no USB port in the car, you need a car adapter or plug it into a power bank (not included). 【Overspeed alarm】The default setting of the vehicle speed is 120KM/H . When the overspeed alarm is active, it will beep 3 times to alert the car driver. Just press "up" or "down" to adjust it. If you want to turn off the speed warning, just adjust the overspeed value to a very impossible high value. 【Precision】 As usual, it is 2-5 KM/H of the car engine speed. The display speed can be easily calibrated by hand. Do it 2-5 miles in