When you receive the package and turn onthe receiver, the receiver displays -- or 00, please dont worry. You only need to mount the on the tire, wait for about 1 minute, and you will see the display shows the pressure and temperature of the tire. Bracket Multiple installation methods; the bracket can be removed, can be installed on the instrument panel, and can also be installed on the glass Intelligent On and Off When the car is started, the vibration of the machine is automatically opened and the machine is shut down automatically when it is still, without manual operation. Intelligent Chip Rapid induction abnormality, beep early warning Type: Intelligent SolarCar Vehicle Sensors Tire Pressure -Solar power charging, dont need to charge by connecting car cigarette lighter -Colorful LCD Digital displaying, clear to show tire information -Rear-time monitoring pressure temperature of 4 tires -Low Vehicle Sensors Air Pressure/high temperature alarm -High Temperature / Leakage / Low Battery Alarm -Intelligent Shock Boot when car moving, dont need to turn on/off -Wireless connect by s, easy install -Build-in s and external s options, meets all your need -Freescale chip s and fit on almost 98% cars on market Two units (PSI / Bar) changeable, you can set the one you like. Build-in ( Option ) - Please install in by Professional car center -More stable and accurate -Anti High Temperate and Cold -IP67 Protection / Waterproof -Working Temperature: -40-125 -Battery Life: 5 Years External ( Option ) - Easy to install, convenient to replace -Dust-Proof / Water-Proof / Anti-theft -Anti High Temperate and Cold -IP67 Protection / Waterproof -Working Temperature: -20-85 -Battery Life: 2 Years,replaceable