This Speedometer Head Up Display GPS Speedometer is designed to accurately and clearly display the vehicle speed. It features a head-up display and the speed unit can be easily switched, making it convenient to use. The speedometer is not affected by weather conditions and can be easily installed. Simply connect the lighter plug to the lighter interface and then connect the lighter with a USB cable for power. The speedometer turns on and off automatically with the ignition and flameout of the car. With its various functions and strong applicability, this speedometer ensures safer driving. The speedometer is equipped with a built-in GPS+Beidou dual-mode chip, providing a high refresh rate of 10Hz for fast and accurate vehicle speed display. It also features a high-performance chip, dual-running memory, and dual-core processor for high-speed and smooth operation. The speedometer has 0 power consumption and can be powered by a 5V car USB or a lighter to USB. These power supply methods are short-circuited power, ensuring no theft of electricity. The speedometer automatically turns on and off with the car, saving electricity. In addition to displaying the vehicle speed, this speedometer also displays the driving direction and the current mileage after the engine is turned off. It includes voice prompts and voice alarm functions to alert you when you are speeding and remind you to reduce speed. It also reminds you to rest when driving for a long time to prevent accidents caused by fatigue driving. The speedometer is compatible with various types of cars, including new energy vehicles, gasoline-electric vehicles, and fuel vehicles, as long as they have a 5V USB interface. The speedometer features automatic sensitivity with its light-sensing mode. It is equipped with light-sensing elements that automatically adjust the brightness of the display according to the intensity of external light, ensuring clear visibility in all lighting conditions. Key Features: Head-up display for accurate and clear speed display Built-in GPS+Beidou dual-mode chip for fast refresh rate 0 power consumption with multiple power supply options Displays driving direction and current mileage Voice prompts and alarm functions for safer driving Compatible with various types of cars Automatic brightness adjustment for clear visibility Easy installation and automatic on/off with car ignition