Function-Solar charging, don't need to connect car cigarette lighter to charge-Color LCD digital display for clear display of tire information-Monitor the pressure and temperature of 4 tires in real time-Low air pressure/high temperature alarm-High Temperature / Leakage / Low Battery Alarm-Intelligent Shock Boot when car moving, don't need to turn on/off-Wireless connect with sensors, easy install,attached to glass-Internal sensors and external sensors options, meet all your needs- Two units (PSI / Bar) changeable, you can set the one you like.-Intelligent On and OffWhen the car is started, the vibration of the machine is automatically opened and the machineis shut down automatically when it is still, without manual operation. Pakage include1*tpms car tire pressure Monitor4* sensor Return Policy All of our items come with a 30-day free return policy. If you need to return, please contact us, let us know the detailed problem and send us some pictures for confirmation. We reserve the right to refuse any returns for objective reasons. Shipping Policy All of our items are shipped free with tracking numbers. Orders will be shipped within 3 working days upon receipt of payment. Most orders will be shipped within 1 working day. In most cases, shipping takes 8-12 working days.