Description:-[SOLAR POWERUSB CHARGING]:2 charging ways which ensure the tire pressure monitoring system will work continuously, & do not occupy the car lighter socket.-[6 ALARM MODES]:fast leak alarm, slow leak alarm, high pressure alarm, high temperature alarm, sensor fault alarm & sensor battery low power alarm, ensure safe driving. [ Press any button will stop alarming ]-[DIGITAL LCD SCREEN]:the monitor displays real-time pressuretemperature, it can be placed anywhere stably & you can easily read the data.-[EASY TO USE]:4 wireless external sensors, easy installation & receive real-time signal. The pressure & temperature data can be switched (default 1.5- 6.0 Bar / 22- 87 Psi), with pressure unit: PSI/ Bar & temperature unit: C/F selectable.-[WIDELY USED]:TPMS is suitable for car tire pressure range less than 6.0 Bar, like sedans, SUV, MPV & etc. Note: If one of the sensors does not work properly after first install, reinstall again & wait a short while, it will work then. Package Included:1 X TPMS4 X External Sensor 4 X Mounting Nut 1 X Wrench 1 X English User Manual 1 X USB (Universal Serial Bus) Charging Cable