SOLAR POWER: Tempered glass solar panels and built-in 500mAh Li-ion battery, does not occupy the car cigarette lighter socket, support USB cable charging, and solar charging DIGITAL SCREEN: Bright backlist and Clear readings, Pressure unit is BAR/PSI, and temperature unit is ℃/℉, Support visual and audio alarm, The alarm value can be customized is 0BAR-5BAR/0PSI-72PSI