Features:Solar power charging, don't need to charge by connecting car cigarette lighter.Colorful LCD digital displaying, clear to show tire information.Rear-time monitoring preure and temperature of 4 tires.Low air preure/high temperature alarm.High temperature/leakage/low battery alarm.Intelligent shock boot when car moving, don't need to turn on/off.Wirele connect by sensors, easy install.Two units (Psi/Bar) changeable that you can set the one you like.Specification:Name: Car TPMS Solar PowerSize: about 4 x 2.56 x 1.26 inchesWorking temperature: -20~ 70Optional preure unit: Psi/BarOptional temperature unit: Deg.C, Deg.FDisplay battery capacity: 400mAhExternal Sensor:Monitoring preure range: 0-3.5 Bar/0-50 PsiMonitor operating temperature: -40 ~ 80/-40~176Waterproof: IP67Function:Anti-corrosionSealed-against dustAnti-theft technologyThe monitor will after the vehicle stop running 5 minutes.Packing List:Packing*1Monitor*1External Sensor*4User Manual*1Anti-theif Nuts*4Wrench*1Notes:1. Please open the display first, then install 4 sensors. When the driving speed reaches 9MPH or 15KPH, the display will automatically update the tire preure data. 2. If one of the sensors does not work properly after the first installation, re-install and wait a while before proceeding.