Parameter:Working frequency: 433.92MHZWorking voltage: 3.7-5VUSB charging current: 250maSleep current : 4maLong-term storage temperature: -30-+90Working current: 6maWorking environment: -30-+85CMonitoring temperature range: -40C +130Monitoring air pressure range: 0-3.5BarFeature:Solar and USB charging:Two charging methods can ensure that the tire pressure monitoring system can work continuously and will not occupy the car cigarette lighter socket.6 alarm modes:Fast leakage alarm, slow leakage alarm, high pressure alarm, high temperature alarm, sensor failure alarm and sensor battery low alarm to ensure safe driving. [Press any button to stop the alarm]Digital LCD screen:The monitor displays real-time pressure and temperature, which can be stably placed anywhere, and you can easily read the data.Easy to use:4 wireless sensors, easy to install and receive real-time signals. Pressure and temperature data can be switched, pressure unit: PSI/Bar and temperature unit: C/F are optional.