ZQKJ G4S HUD Auto Electronics Accessories GPS System Head Up Display Digital Speedometer Speeding Alarm LED Tools For All Cars Product specifications:Model: G4SSystem: GPS satellite systemScreen size: 2.5 inchesMachine size: 2.03*0.55*2.03in (52*14*52mm)Material: ABS+PCScreen type: LEDApplicable model: Applicable to all carsColor: Green/WhiteColors: Available in two colors, white and green.(Purchase whichever color you want, not adjustable)Main display function: Speed, Time, Driving direction, Auto-sensitivity, Overspeed alarm, MPH/Km/H switch, Speed/Time auto switch, Audible alarm switch, Fatigue driving reminder...Two major alarm functions: Speed alarm: When the speed reaches a certain value, HUD will issue an alarm sound. The default alarm value is 150km/h (adjustable range: 0-250km/h)Fatigue driving reminder: The car driving time reaches a certain value of the setting time, and HUD will make alarm sound. The default alarm value is 8.0 hours (adjustable range: 1.0-8.0 hours)Screen display: A variety of screens show matching, can switch the screen with one click, which is convenient and cool.Brightness adjustment: HUD comes with an optical chip, which can be adjusted to comfortable brightness according to the strength of the external light.You can also set fixed brightness according to your own preference.A glass suction cup is included in the package, which can rotate at 360 degrees and can be disposed of machines everywhere. The GPS satellite system is suitable for all cars.Package list: 1. G4S HUD2. USB data cable3. Anti -slip pad4. 360 suction cup bracket5. English User Manual