Review on ACECAR Upgrade T800 Universal Car HUD Head Up Display: Digital GPS Speedometer with Compass, Latitude and Longitude, Speed Test, Brake Test, Alarm, HD LCD Display for All Vehicles by Christopher Ruth

All the functions of the device work well. This is slightly behind actual speed, but I expect it to be the estimated speed of the GPS satellites. With 3M double-sided tape, it sticks well to the dashboard, just have to see how long it lasts. The display is easy to read day or night and can be easily adjusted to show the information you need. The power cord is long enough for the display to be centered on top of the dash, with the cord running to the side, then down and under the dash to the outlet. So far, I am very satisfied.