M30 Universal HUD GPS Speedometer Clock Electronic Compass for Car Features: Applicable to domestic car series, Asian car series, American car series and European car series, Equipped with high-precision GPS + Beidou dual-channel module Fully automatic monitoring of vehicle driving conditions, Use the light intensity sensed by the sensor to adjust the screen brightness LED light display, Designed with PC high temperature resistant material, Start with the car, automatic sleep function when parking This product is a vehicle-mounted HUD multifunctional display instrument, through GPS/ The Beidou dual-channel module acquires data from satellites, and has the advantages of dual-signal stability, common to all models on the market, is a must-have artifact for self-driving enthusiasts. Product parameters: Power supply: 5V Working temperature: -40~+80 GPS data refresh rate: 1 s Wireless transmission frequency: 2.4GHzGPS Speed accuracy: Less than 0.36Km/hGPS Clock error: Less than 1minute Voltage measurement accuracy: 0.5V Cold start time: 32s (average) Hot start time: 1 s (average) Main function and alarm function Speed, time, compass display Overspeed alarm Material: Plastic colour: black Package Contents: 1 x heads up display Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. M30 Universal HUD GPS Speedometer Car Clock Electronic Compass Green Light Fatigue Driving Reminder for Car Motorcycle Fully automatic monitoring of vehicle driving conditions, Use the light intensity sensed by the sensor to adjust the screen brightness LED light display, Designed with PC high temperature resistant material, Start with the car, automatic sleep function when parking