Features: 1. Solar powered.X98 HUD is equipped with a solar panel, which can be charged automatically in the sunlight, or you can connect the device to the car power with a USB cable. However, solar power can only extend the working time of the battery and cannot replace the USB cable for direct charging. 2. Feature-rich. Almost everything you need to read while driving will be displayed by this HUD, including car speed, clock, altitude, km/h and mph, car's ambient temperature and battery level, over-speed alarm, and fatigue driving alarm. It is a good partner for your driving. (Altitude display/temperature display, 10 seconds intelligent switching function display between the two; default 120km/h speed alarm, you can manually adjust the alarm value; you can set your own fatigue driving time (The default vehicle continues to drive for 4 hours to remind) 3. Speed calibration. If the car speed is not accurate, you can calibrate the car speed by hand: long press the "SET" button to enter the setting page, press the "SET" button every 3 seconds, and you will see the data display area flashing, select the car speed value, you can increase and decrease the speed unit as needed. 4. Time correction. When testing in the car, if the time cannot be automatically corrected, you can also adjust the time by hand (the procedure is the same as speed correction above). 5. Screen brightness intelligent recognition. The solar panels can intelligently identify the brightness, the screen is brighter and clearer during the day, and the screen is softer at night. 6. Applicable to all vehicles. Unlike another car HUDs, you don't need to worry about compatibility issues, S98 can be applied to all vehicles, no matter which make or model, all over the world, because S98 is based on the internal GPS module. Note: This device is a GPS digital speedometer and all data is collected from satellites. Therefore, if tested at home, maybe the speed and time will not be displayed correctly. Please test in a car with a good outdoor signal. Specifications. Model: S98 Material: ABS+PC Power supply: USB charging + solar power Appearance size: 10*8*3CM Input signal: GPS positioning Applicable models: Universal Package includes 1x Solar HUD 1x USB charging cable 1x Instruction manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.