Features: *Tire Pressure Monitoring System lets you get real-time tire pressure data, temperature data and status, always keeping an eye on car performance. *Combined with the solar energy display that is green, low carbon and renewable, enabling you to charge the device faster and conveniently. *4 wheels' tire pressure and temperature display simultaneously, high/low tire pressure alarm, high temperature alarm and air leakage condition alarm. *The real-time tire pressure data, reliable alarm system delivers alerts once an unusual situation occurs, very convenient and practical. *TPMS adopts wireless transmission, and no wire connection required, easy installation, and it automatically sleep when there is no vibration. Specification: Monitor: Display screen: LCD Operating temperature: -20℃ ~ 80℃ Working voltage: 3.5-4.2V Daytime operating current/Night operating current/Standby current:＜20mA/＜4mA/＜50uA Transmission frequency: 433.92MHZ+/-20KHZ Transmission mode: FSK Pressure unit: BAR/PSI Charging ways:Solar energy/USB (USB cable is not included) Battery:1 * 402040 3.7V 300mAh Monitor size: Approx.9.5*3*1.5cm Monitor weight(with solar panel): Approx.71g Sensor: Operating temperature: - 20℃ ~ 80℃ Working voltage: 2-3.6V Standby current:＜1uA Transmission frequency: 433.92MHZ+/-20KHZ Transmitted power:＞8dBm Open Distance:＞30M Battery (each sensor): 1 * CR1632 3V Sensor size (each): Approx.2*2*2cm Sensor weight (each): Approx.8g Package Size: 21*15*6cm / 8.27*5.91*2.36in. Package Weight: 233g / 8.22oz Package List: 1 * Displayer 4 * External Sensors 1 * Wrench 4 * Nut 1 * Button-head Cap 1 * User Manual(English)