Features GPS 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. 3 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. Type 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. Wide Application: This digital GPS speedometer has a wide range of applications and can be used in industrial, automotive and home electronics. Excellent 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. Spec: Item Type: Digital Speedometer Material: PCB Function: Time, Temperature, Humidity, Speed Display 3 In 1 Time Format Setting: 12, 24 Hours Time Setting: Hour+1, Minute+1 Temperature And Humidity Display: C Temperature, H Humidity, AUTO Automatic Switching Brightness Setting: 8 Levels Of Brightness Line Speed Setting: 0-200km/h Buzzer Setting: BEE On, OFF Off Battery: CR1220 Button Battery x 1 ( Shipped Without Battery ) How To Use: 1. There are 3 functions, displaying time, displaying temperature and humidity, and displaying speed (Note: Due to the different voltage, it is not possible to plug in the Type C power cord while accessing the battery.) 2. After powering up, it defaults to the time display page. If GPS doesn't receive the signal, the time will show 00:00. get outdoor, after receiving the GPS signal, the speaker will sound and calibrate the time automatically. 3. In the clock display page, press S2 to switch to the temperature and humidity display interface. By default, the temperature and humidity will be displayed in turns every 5 seconds. Press S3 to return to the clock display interface. 4. In the temperature and humidity display page, press S2 to switch to the speed display interface. If the for GPS is not receiving signal, the speed will show 000. you need to connect the for GPS outdoors to see the moving speed. Press S3 to return to the temperature and humidity display interface. packing list: 1 x Digital Speedometer Package List 1 x Digital Speedometer