1Powered by solar energy, it comes with 4 external sensors. 2LCD digital displaying, clear to show tire information. 3Comes with an extra mini USB port, can be charged many time. 4Rear-time monitoring pressure & temperature of 4 tires at the same time. 5Each sensor has a separate ID code. The tire position can be interchanged.Features:Powered by solar energy, it comes with 4 external sensors. LCD digital displaying, clear to show tire information. Comes with an extra mini USB port, can be charged many time. Rear-time monitoring pressure & temperature of 4 tires at the same time. Each sensor has a separate ID code. The tire position can be interchanged. Fuel-saving, predicting air leakage, extending tire service life. Temperature explosion-proof battery, long-lasting power, more accurate monitoring data. Specification:Model: U902L-WF Monitor:Working Temperature: -20 ~ +80Storage Temperature: -30 ~ +85Input Voltage: DC 5VTransmitting Frequency: 433.92MHzSize: 88 * 68 * 25mm/3.5 * 2.7 * 1.0inchExternal Sensor:Working Temperature: -40 ~ +105Storage Temperature: -40 ~ +120Pressure Measurement Range: 0~116psi(0-8bar)Pressure Accuracy: 1.5PSI0.1barTemperature Accuracy: 3Transmitting Power: Transmitting Frequency: 433.92MHzBattery Life-span: >2 yearsSize(D*H): 23 * 15mm/0.9 * 0.6inchMaterial: ABS PlasticColor: Shown as PicturePackage Weight: approx.349g/12.3ozPackage list:1 * Monitor4 * External Sensors1 * Fixer1 * Bracket1 * Power Cable1 * Spanner1 * Set of Screws1 * User Manual