6 alarm modes and user mode The TPMS provides 6 alarm modes: fast leak, low pressure, high pressure, high temperature, sensor fault, and sensor battery low. After pairing, the system automatically sets the current sensor pressure as the reference. You can manually adjust the reference pressure. Alarm range: +25% PSI to -15% PSI of the reference pressure. 4 external high accuracy sensors Includes 4 external sensors with low power consumption and long service life. Sensors are dust, snow and water resistant. Installation sequence: start the host first, then install the sensors. If any sensor is abnormal, unscrew all sensors, turn off the host, reinstall, and wait 10 minutes. Adaptive backlight and digital LCD screen The unit automatically adjusts the backlight to ambient light for easy reading. Real-time display of tire pressure and temperature for 4 tires. Pressure units: PSI or BAR; temperature units: F or C. Supports audio alarm with a customizable alarm value from 0-72 PSI or 0-5.0 BAR. Solar power and USB dual charging Solar automatic charging keeps the system powered. When sunlight is insufficient, USB charging is available to ensure continuous operation. The TPMS does not occupy the car cigarette lighter socket. Use scenarios - Long road trips: monitor all four tires in real time to prevent slow leaks and extend tire life. - Harsh weather or mountain driving: quickly detect pressure or temperature deviations. - Off-grid travel or daily use: solar charging with USB backup ensures ongoing monitoring without draining vehicle power.