This speedometer has a head-up display, the vehicle speed can be displayed accurately and clearly, and the speed unit can be switched, making it more convenient for you to use. The use of this speedometer is not affected by the weather. The installation is very simple. Connect the cigarette lighter plug to the cigarette lighter interface, and then connect the cigarette lighter with a USB cable, and power from the cigarette lighter interface to use. The speedometer turns on and off automatically with the ignition and flameout of the car. Various functions and strong applicability make your driving safer. Features: [Professional]This speedometer has a built-in GPS+Beidou dual-mode chip, a high refresh rate of 10Hz, and a fast refresh of the vehicle speed without delay. High-performance chip, dual-running memory, dual-core processor, high-speed and smooth operation. [0 Power Consumption]This speedometer can be powered by a 5V car USB or a cigarette lighter to USB to achieve zero power consumption. These two power supply methods are short-circuited power, and the car will automatically cut off the power when the car is turned off, so there will be no theft of electricity. The speedometer will automatically turn on and off when the car is started and stopped, without wasting electricity. [Multifunction]This speedometer can not only accurately display the vehicle speed through GPS, but also display the driving direction, and display the current mileage after the flame is turned off. At the same time, there are voice prompts and voice alarm functions. He will alert you when you are speeding, remind you to reduce the speed, and remind you to rest when driving for a long time to avoid accidents caused by fatigue driving. Let you drive more safely and go home safely. [Strong Applicability]This speedometer can be used on various types of cars. New energy vehicles, gasoline-electric hybrid vehicles, fuel vehicles, etc. can be used as long as they have a 5V USB interface. [Automatic Sensitivity]This speedometer has an automatic light-sensing mode, which is equipped with light-sensing elements inside, which can automatically adjust the brightness of the display according to the intensity of external light, and it can be clearly seen in all kinds of light. Specifications: Color: Black Material: ABS, PC Occasion: Car Package Size: 14.3x9x5.1cm/5.63*3.54*2.01inch Package Weight: 141g/0.31lb Packing List: 1 * Speedometer 1 * Non-slip Mat 1 * Manual 1 * USB Cable Notes: 1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures. 2. Please allow slight dimension difference due to different manual measurements.