Features:OOTDTYHead-up displays speed, mph-or km/h display, riding time, distance calculation and display, automatically identifies the time zone, accurate gps local time display, battery voltage, etc. Overspeed and fatigue alarm driving alarm to ensure safety in long driving distance. The large screen and green light display will be to protect the driver's eyes, let the driver feel more comfortable, especially for long driving distance. Speed and compass data come from satellites, timely and accurately. In particular, the magnetic field does not affect the direction of the compass. Compatible with all cars, trucks, bicycle and motorcycle. Specifications:Material: ABS+PClength: about 20.6cm/23cm Screen: 8-inch/9-inch (optional)Input Voltage: DC12-24V Input Source: more than 150mA Power Supply: Car Cigarette Lighter-Operating Humidity: 20%-85%Working Temperature: -30°C-80°C Satellite Positioning Speed: About 1-3 minutes in outdoor open places, no satellite signal indoors (cloudy and rainy days affect the satellite positioning speed)Package Included:1x Speedometer DigitalNote: Please allow 1-3cm error due to manual measurement. Pls make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.