Solar powered TPMS for cars with 4 internal sensors alarm1、It can be placed on the surface of center console stably, and clearly show the tires’ pressure and temperature in real-time. Solar power & USB charging ensure the TPMS will work continuously, multiple alarm modes will alert immediately when the sensor detects an abnormal condition in the tire temperature or pressure. 2、Compared with external sensors, the internal sensor has higher accuracy, stronger environmental adaptability, better anti-theft performance, and a larger capacity battery, which can work last up to 5 years. 3、The TPMS is suitable for tire pressure range less than 6.0 Bar, like sedans, SUV, MPV and etc. TPMS automatic update the tire's pressure and temperature per 6 seconds, keep your driving safe. Pressure accuracy: 0.1bar. 4、Since the installation of the internal sensor is a bit complicated, we suggest that an experienced person or to tire service store to install the internal sensor. Once installed, you can easily monitor the pressure and temperature of the tires without worrying about the theft or damage to the sensor. 5、Please turn on the monitor first and then install the 4 sensors. When the driving speed is up to 9mph or 15kph, the display will update the data of tire pressure automatically. Any question please feel free to contact us.