Smart Gauge Speedometer 3 in 1 LED Time Temperature and Humidity Speed Guage with Speeding Alarm 1GPS Measurement Of Vehicle Speed: This digital display speed gauge adopts GPS to measure the vehicle speed, automatically calibrate the time, and you can set the speeding alarm, which is very practical. 23 In 1 Function: This digital speedometer has 3 in 1 function, temperature and humidity display function is that temperature and humidity parameters can be set to display only the temperature, overspeed alarm is thatGPS automatically measures the current speed (can be set to overspeed alarm), time display can be automatically calibrated by for GPS. 3Type C Cable Power Supply: This smart gauge speedometer supports type C cable power supply, which can be powered by rechargeable batteries, laptops and many other ways, or by installing a CR1220 botton cell battery. 4Wide Application: This digital GPS speedometer has a wide range of applications and can be used in industrial, automotive and home electronics. 5Excellent PCB Material: This GPS digital speed meter is made of excellent PCB material, which is sturdy and wear resistant, not easy to be damaged, and has a long service life.