3.7in Universal Car HUD Display Digital Speedometer Water Temp Voltage Mileage Windshield Projector for Auto Driving Features： 1、The display of vehicle speed, water temperature, voltage, and mileage can be switched. 2、Five warning functions: overspeed alarm, water temperature alarm, low voltage alarm, fault alarm, and rest reminder. 3、Large and clear display for convenient reading. 4、Accurate and stable detect. 5、Easy to install and stable in use. 6、Turn on when the car drive, sleep when car stopped. 7、Intelligent adjustment of display brightness based on the intensity of light. Specification： This product can help you to see your driving parameters without lower your heads. Making driving safer and more convenient. Features: The display of vehicle speed, water temperature, voltage, and mileage can be switched. Five warning functions: overspeed alarm, water temperature alarm, low voltage alarm, fault alarm, and rest reminder. Large and clear display for convenient reading. Accurate and stable detect. Easy to install and stable in use. Turn on when the car drive, sleep when car stopped. Intelligent adjustment of display brightness based on the intensity of light. Specifications: Color: black Material: PC+ABS Display: 3.7in Item size: 87 * 37 * 15mm / 3.4 * 1.5 * 0.6in Package size: 160 * 100 * 40mm / 6.3 * 3.9 * 1.6in Package weight: 150g / 5.3ounce Packing List: 1 * Car HeadUp Display Package List： 1 * Car HeadUp Display