This is a smart and powerful car meter, which can help you see your driving parameters without lower head. Features: Head-up display of driving speed and altitude. Calculation and display of driving time and mileage. Easy installation, plug-and-play, no professional installation is required. Compatible with most cars. Use the calculation guided by the global position system signal. No wiring needed to VSS (vehicle speed signal). Display MPH or KM/h. Automatically adjust the brightness via s-sensor for day and night driving. Display the vehicle driving speed. Green color speed display, easy to watch. Overspeed alarm setting. Display the total mileage after the car is stopped. Specifications: Main Color: Black Main Material: ABS + PC Screen Size: 4.5inch Input Current: DC50-120mA Item Size: 105 * 59 * 16mm / 4.1 * 2.3 * 0.6in Item Weight: 78g / 2.8ounce Package Size: 115 * 65 * 71mm / 4.5 * 2.6 * 2.8in Package Weight: 142g / 5.0ounce Packing List: 1 * Car Speedometer 1 * Bracket 1 * USB Cable 1 * Rubber Band