Parameter: 1.Monitoring system body Operating voltage: 3.7-5V Storage temperature:-30C-90C working temperature:-30C-85C RF Emission frequency:433.92MH50KHz RF Signal sensitivity:-90dbm Display mode:LCD Color Bright screen current:?6mA Black screen current:?4mA Size:85*95MM 2.External Sensor Battery life:24 months Operating voltage:2.1-3.6V Storage temperature:-30C-90C working temperature:-30C-85C Temperature resolution:2C?25C? Pressure range:0-4.3Bar Pressure resolution:0.1Bar Waterproof grade:IP67 Transmitted power:?10dBm Emission frequency:433.92MHz Size:21mm*17mm weight:?8.0g lithium battery:CR1632?Model? 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 Solve the sensor does not work:Match sensor(Vent) 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 /'/'left/right select key/'/' to learn ID opertion.Select tire you plan to learn ID of sensor by press/'/'menu key/'/',default setting is /'/'FL/'/'>/'/'FR/'/'>/'/'RR/'/'>/'/'RL. 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 set Solar Charging Tyre Pressure Monitoring System 4 External sensors 1 set accessories (tool) In the title and we have provided details of the product including its features and specifications, please note the size and dimensions of the product to ensure it meets your needs. Warm reminder: Due to lighting effects, monitor brightness, manual measurement, etc., there may be some slight differences in color and size between photos and actual items. Sincerely hope you can understand. During the shopping process, if you have any questions, please feel free to consult us, we will reply to you within 24 hours, I wish you a happy shopping!