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 preure and temperature of the tire. Notice: Please push left button over 3 minitus to turn on monitor, if it does not work, please try again after charging. Type: Intelligent Solar TPMS Car Tire Preure-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 & 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-Internal sensors and external sensors options, meets all your need-Two units (PSI / Bar) changeable, you can set the one you like.Built-in SensorWorking Temperature:--40 C -125CWorking Frequency:433.92MHZworking humidity:Max95%Tire monitoring range value:0bar-3.5bar Deviation0.1Battery life:2-3 yearsTransmit power:R&D environment test below-17dbExternal sensorsWorking Temperature:--20C -85CWorking Frequency:433.92MHZWorking Frequency:433.92MHZworking humidity:Max95%Tire monitoring range value:0bar-3.5bar Deviation0.1Battery life:1-2yearsTransmit power:R&D environment test below-17db Solar ChargingUSB charging, Prevent night / cloudy no electricity. Vibration Power on Automatic Power offWhen you open the door, it will sense the vibration and open. It will automatically shut down after 3 minutes of parking. Two ways of installationThe bracket is detachable and can be mounted on the center console or windshield.