One year warranty service Multiple alarm types Users can set the pressure, temperature and battery alarm values Operating System The Tire Pressure Monitoring System is designed for Smartphone.Compatible with IOS and Android. Bluetooth 5.0 with a high-speed connection, stable transmission, accurate data, Longer Acceptance Distance.Easy installation and disassemble 1, Scan QR code on the card, then download and install. 2, Please follow the sensor's mark and install the sensor on the corresponding tire . please install slowly to make the air pressure fully contact the sensor. (The pressure range that can be set is 14.5~92.8Psi, 1.0~6.4Bar,100Kpa~640Kpa)4 Tire external sensors Dynamically monitor tire pressure on 4 wheels at the same time, prevent damage from a flat tire, Improve fuel efficiency, prolong tire life span, During travel, tire pressure and temperature displayed in real-time and send an alert when statistics' abnormal. Necessary alarm system The Bluetooth external TPMS sensors are with Low Power Consumption and long-lasting battery life for almost 2~3 Years. Dynamically monitor tire pressure and temperature, prolongs tire life, improve road safety. It is best to reference to user manual before using.