Please note!!!When you receive the package and turn onthe receiver, the receiver displays --"or 00, please don't worry. You only need to mount the sensor on the tire, wait for about 1 minute, and you will see the display shows the pressure and temperature of the tire. Type: Jansite Intelligent Solar TPMS Car Tire Pressure -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 pressure & temperature of 4 tires -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 by sensors, easy install -Build-in sensors and external sensors options, meets all your need - Two units (PSI / Bar) changeable, you can set the one you like. Build-in Sensor ( 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, replaceable External Sensor ( 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 Risk early-warning Accurate early warning, safer driving, more reassuring 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. 1+1 charging mode Solar charging +USB charging Suitable for many kinds of cars Suitable for Cars, ORV, SUV, MPV, Minibus, Wagon, etc. The difference between built-in and external