Notice: Please push left button over 3 minitus to turn on monitor, if it does not work, please try again after charging. Parameter 1.Monitoring system body Operating voltage: 3.7-5V Storage temperature:-30-90 working temperature:-30-85 RF Emission frequency:433.92MH50KHz RF Signal sensitivity:-90dbm Display mode:LCD Color Bright screen current:6mA Black screen current:4mA Size:85*95MM External Sensor Battery life:24 months Operating voltage:2.1-3.6V Storage temperature:-30-90 working temperature:-30-85 Temperature resolution:225 Pressure range:0-3.5 Bar Pressure resolution:0.1Bar Waterproof grade:IP67 Transmitted power:10dBm Emission frequency:433.92MHz Size:21mm*17mm weight:8.0g lithium battery:CR1632Model Features: Solar power charging; High and low pressure, leak alarm; LCD display screen, Simple user interface High accuracy, Using Freescale imported chips; Real-time monitoring tire pressure 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 Changeable Operation for Pairing Sensors: Solve the sensor does not work:Match sensor with Air Valve Long press /'/'menu key/'/' 3 seconds to /'/'U/S/'/',then short press /'/'menu key/'/' several times to enter/'/'LID/'/' interface,it shows ID of four tires and car icon. Short press /'/'leftight select key/'/' to learn ID opertion.Select tire you plan to learn ID of sensor by press/'/'menu key/'/',default setting is /'/'FL/'/' When tire is selected,display new /'/'ID/'/' in receiver after active sensor//'s ID(internal sensor active by charging/vent tier). Do the same operation to match other three sensor.When all sensor are matched,short press /'/'menu key/'/' to save and go to /'/'Ex/'/'. Specification: Solar power charging LCD displaying Adhere to windscreen for installation Operating frequency: 433.92Mhz 50KHz Operating voltage: 3.7-5 V Working temperature: -20 -75 Adhere to windscreen for installation Operating frequency: 433.92Mhz 50KHz Operating voltage: 3.7-5 V Working temperature: -20 -75 Packing: 1*Solar Charging Tyre Pressure Monitoring System Host 4*External sensors 1*USB cable 1*set Install Tool