Notice: Please push left button over 3 minitus to turn on monitor, if it does not work, please try again after charging.Parameter1.Monitoring system bodyOperating voltage: 3.7-5VStorage temperature:-30C-90Cworking temperature:-30C-85CRF Emiion frequency:433.92MH50KHzRF Signal sensitivity:-90dbmDisplay mode:LCD ColorBright screen current:6mABlack screen current:4mASize:85*95MMExternal SensorBattery life:24 monthsOperating voltage:2.1-3.6VStorage temperature:-30C-90Cworking temperature:-30C-85CTemperature resolution:2C25CPreure range:0-4.3BarPreure resolution:0.1BarWaterproof grade:IP67Transmitted power:10dBmEmiion frequency:433.92MHzSize:21mm*17mmweight:8.0glithium battery:CR1632ModelFeatures:Solar power charging;High and low preure, leak alarm;LCD display screen, Simple user interfaceHigh accuracy, Using Freescale imported chips;Real-time monitoring tire preure and temperature;Smart start: parking automatically sleep, the car starts automatically wake up.Two units (PSI / Bar) changeable, you can set the one you like.Sensors' battery ChangeableOperation for Pairing Sensors:Solve the sensor does not work:Match sensor with Air Valve