X90 Car Electronics Digital GPS Speedometer Car HUD MPH KM/H Inclinometer Compass with Head Up Display HUD for Off-Road Vehicle Product Description: , compass, time voltage status and car battery to ensure driving safety.Feature:Applicable to Asian cars, American cars, European cars.Equipped with high-precision GPS satellite signal module.Automatically monitor vehicle driving conditions.Adjust screen brightness with light sensor sensitivity.Free rotation which is more sensitive.Adopts high resolution HD color LCD display.Feature:Precisely shows the vehicle's tilt angle with clear notification when the angle exceeds 40 deg; alarm alerts.Precisely show the vehicle's tilt angle changes , when the angle exceeds 40 deg;, alarm alarms ensure your safety. When connected to the power supply, there will be a backlight inside, which will help you see clearly in case of night or darkness. Elevation error within 5-100 meters. When you start the vehicle, the speedometer starts automatically, After parking the car, the meter will be in sleep mode automatically. Overspeed alarm. Driving fatigue warning after 4 hours of driving Specification: Power: DC 10V ~ 30V Depression and elevation angle: -40 + 40 Clock error value: 1 minute Voltage measurement accuracy: O .5V GPS Cold Boot Time: 32s (Average) GPS Data Refresh Time: 1s Operating Temperature: -40 ~ +80Tilt Angle: -40 + 40Voltage Measuring Range: DC5V ~ 30V Speed Accuracy: 0.36Km/h GPS Hot Boot Time : 1s (medium) Wireless transmission frequency: 2.4GHz Product size: 170*68*60(mm) Instruction: Park the car on a flat surface, stick the adhesive on the product, adjust and fix it on the vehicle to facilitate horizontal view. Before driving, connect power and wait to receive the GPS satellite signal until the data is normal. Long and hold the setting button and click the start button to adjust the electronic clock. Long press the start button and then click the setting button to adjust the X90 time. Package includes: 1 * X90 HUD 1 * Cigarette Lighter 1 * Fixed Pad 1 * User Manual 1 * Packing Box How to switch from miles to Km? Supports both MPH/h and KM/h Press M, switch MPH/h inch and KM/h metric (Note : altitude is in feet in MPH/h mode and meters in KM/h mode)(Explanation: MPH/h is lit to MPH/h mode, MPH/h is off to indicate KM/h mode) How to adjust the time? In the off state press the power button. After the screen lights up, press and hold the M button/Power button for 3-4 seconds immediately1. Decrease time: long press M key will automatically enter the adjustment interface