1Operating System: The tire pressure monitoring system is designed for smartphones, simply connect your smartphone to the application "Tpmsii". High speed connection, stable transmission, accurate data and long reception distance. 24 External Sensors: The system can dyamically monitors the tire pressure of all 4 wheels to prevent tire leakage damage and improve fuel efficiency. During driving, it displays tire pressure and tire temperature in real time, and issues an alarm when the statistics are abnormal. 3Easy Install: Scan the Qr code on the card to download and install. Install the sensor to the corresponding tire according to the sensor markings, no need to remove the tire, it takes a few minutes to display the tire pressure and temperature after installation. 4Alarm Types: The tire pressure monitoring system offers 5 alarm typesfast and slow leak alarms, high pressure alarms, high temperature alarms and low battery alarms. User can set pressure, temperature and battery alarm values. 5Tpms Sensors: Bluetooth external Tpms sensor with low power consumption and long battery life of 2~3 years to extend tire life and improve driving safety.