USB or Solar Charging Car TPMS Tire Preure Monitoring System HD Digital LCD Display Auto Alarm tool Wirele 4 external Sensor Notice: Please push left button over 3 minitus to turn on monitor, if it does not work, please try again after charging. 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 Parameter 1.Monitoring system body Operating voltage: 3.7-5V Storage temperature:-30C-90C working temperature:-30C-85C RF Emiion frequency:433.92MH50KHz RF Signal sensitivity:-90dbm Display mode:LCD Color Bright screen current:6mA Black screen current:4mA Size:85*95MM Built-in Sensor Working Temperature:--40 C -125C Working Frequency:433.92MHZ working humidity:Max95% Tire monitoring range value:0bar-3.5bar Deviation0.013 Battery life:5 years Transmit power:R&D environment test below-17db Features: Solar power charging; High and low preure, leak alarm; LCD display screen, Simple user interface High 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' batteryChangeable Description: Solve the sensor does not work:Match sensor(Vent)